Synonym of tough nut

immovable adamant inflexible obdurate steadfast resolute unwavering unyielding stubborn dogged unbending uncompromising firm unrelenting unswerving determined stiff-necked tenacious unfailing unshakeable adamantine bullheaded constant hard hardened hardheaded hard-nosed headstrong impassive implacable inconvincible inexorable intransigent iron-willed mulish obstinate opinionated ossified pat pertinacious perverse pigheaded self-opinionated self-willed steely strong-willed unshakable wilful willful indurate rock-ribbed stony-hearted unchangeable unimpressionable unshaken dead set immutable permanent quiescent rigid set solid steady unalterable unmodifiable dug in locked in stand pat dead set on set in concrete set in stone sticking to one's guns staunch perseverant unremitting relentless dedicated committed untiring unfaltering tireless unflinching purposeful unflagging undeviating indefatigable grim perseverative unstoppable intent focused patient laborious hanging tough never-tiring unappeasable never give up focussed insistent stout-hearted persistent persevering resolved unflappable driven undaunted diligent spirited stalwart assiduous valiant single-minded gritty mettlesome full of determination strong-minded decided unfluctuating unhesitating fixed unvacillating abiding sure enduring sustained unqualified unquestioning wholehearted never-failing bound bound and determined meaning business bent on going all the way

intractable contrary stubborn awkward difficult obstinate wilful obdurate perverse unyielding refractory unbending uncooperative unruly wayward recalcitrant wild bull-headed disobedient fractious incurable inflexible uncompromising uncontrollable ungovernable balky cantankerous headstrong indomitable intransigent obstreperous stiff-necked unaccommodating unadaptable undisciplined unmalleable unmanageable contumacious defiant froward incompliant insubordinate rebel rebellious recusant restive rock-ribbed self-willed untoward willful bloody-minded hard-line immovable indocile insoluble knotty locked mulish pat pertinacious pigheaded problematic resolute tenacious thorny tough unpliable hang tough locked in adamant opinionated dogged unrelenting hard hardheaded bolshie determined bullheaded disorderly mutinous implacable firm adamantine inexorable rigid hard-nosed hardened steadfast relentless single-minded inconvincible ossified stroppy persistent self-opinionated troublesome cussed incontrollable fixed unreasonable incorrigible indurate unwavering unpersuadable unshakeable turbulent ornery disruptive uncompliant out of control rowdy strong-willed strict delinquent riotous insurgent resistant annoying noncompliant iron-willed unflinching disaffected strong-minded renitent grim contrarious rough stubborn as a mule cross-grained vexatious persevering stiff tiresome naughty non-compliant pervicacious thrawn harsh unrestrained unshakable rigorous quarrelsome stringent boisterous seditious disobliging obstructive badly behaved errant severe dissident mischievous pugnacious unpredictable lawless iron hardline unbiddable set in one's ways diehard unhelpful stern steely out of hand anarchic oppressive violent dissentient insurrectionary nonconformist hard-core remorseless unwilling brassbound impish pig-headed draconian exacting roguish rascally troublemaking irrepressible trying staunch mean exasperating belligerent hard and fast chaotic adverse unswayable factious bellicose insubmissive revolutionary hostile undeviating argumentative antagonistic truculent insolent capricious pitiless wrong-headed reckless unbendable immutable undisciplinable tricky uncontrolled deaf to reason challenging militant attention-seeking rugged authoritarian impetuous negative heedless resolved irritating ill-disciplined impervious badly-behaved demanding unrestrainable strong bothersome prickly extreme unsparing die-hard drastic unrepentant hard-boiled aggressive merciless touchy austere importunate contentious unsympathetic ill-natured heavy-handed no-nonsense invariable dyed-in-the-wool alienated dogmatic not giving an inch unfavorable unfavourable tricksy rude impossible subversive brutal dead set on malcontent standing one's ground haughty fiendish inconvenient combative lawbreaking resisting resistive dissenting hidebound peevish purposeful constant radical arbitrary blinkered stalwart iconoclastic obstinately disobedient loud noisy picky nonconforming dour impudent insistent mule insurrectionist treacherous opposing dissentious uptight disciplinary cast-iron intemperate imprudent assertive drunken impulsive rash forward bawdy unchangeable feisty unresponsive disputatious rumbustious threatening immoderate intolerable inimical heavy unmovable irksome ruthless decided vexing heady two-fisted sharp solid unbridled unfaltering disturbing unmoved out of line unappeasable bad dead set ugly stony cruel domineering crabby pesky misbehaving iron-fisted insuppressible sensitive burdensome intense irritable nasty hardhearted as stubborn as a mule delicate opinionative playful impolite chippy callous unsentimental tyrannical wicked devilish set in stone fierce unforgiving cool brattish scampish puckish prankish wanton gallus stand pat wrong hard to handle hard-hearted full of mischief hard-bitten estranged irreconcilable irrational unconverted unreformed nonobservant biased illogical renegade inveterate unbudgeable cross petulant intent morose vicious malevolent maleficent malicious spiteful malign withstanding assiduous uncomplying indefatigable tireless thuggish forceful narrow-minded shrewish maverick heretical prejudiced intolerant untrained impotent rampant erratic fickle stiffened negativistic averse loath reluctant indisposed hesitant decisive pushy mullish unsteady unschooled up in arms romping anarchical lively rollicking with a will of one's own determined to have one's own way unregenerate unalterable apostate schismatic traitorous unorthodox mutinying disturbed maladjusted durable immalleable unbreakable radge unreceptive boneheaded ungiving convinced disloyal inconsistent ungoverned unimpressible aloof proud inalterable forbidding illiberal unbearable undependable impertinent bullhead uncompassionate unemotional without law and order freaked excited overwhelming abandoned overpowering hard-shell locked-in immoral aberrant cold fish proof against persuasion hanging tough restless anarchistic warring armed sabotaging individualistic treasonable attacking contrariant discordant arsey paradoxical disagreeing lacking self-control problem puritanical vociferous tempestuous uproarious raucous wrongheaded antipathetic converse untimely with one's feet dug in with one's toes dug in unfortunate unflexible crisp doctrinaire beside oneself set tough nut to crack clamorous rampaging set in your ways rambunctious stuffy unpermissive do or die dug in hold the fort standing pat hard as nails sticking to one's guns hold your ground hold the line unchanging inopportune disciplinarian ascetical by the book absolute pressing astringent uncharitable imperious dire browbeating formidable ascetic autocratic grave self-indulgent misbehaved roisterous rackety tumultuous anti overbearing unamenable hard to please fussy rip-roaring artful infantile frolicsome ill-behaved ruffianly inconsiderate raunchy kiddish sly foxy thoughtless immature childish disrespectful like a loose cannon unexpected unanticipated ill-timed rampageous roistering fastidious boorish finicky flinty hard-hitting against opposed piercing screaming booming blusterous strepitous categorical cramped complex bulky discommodious incommodious disagreeable upsetting oafish bearish irascible discontented dissatisfied surprising unforeseen disastrous unusual unpredicted mistimed sinful sustained fossilized unvarying invariant raising the roof raising Cain cold teasing worthless testy choosy snappy temperamental querulous critical grumbly evil worrying worrisome unstoppable uncaring ferocious unwelcome infelicitous inapt unsuitable inappropriate unlucky inauspicious brick-wall taxing vexed captious disputative hypercritical huffy overcritical particular over-particular dictatorial ungracious finical invidious crotchety uppity sour hard to satisfy perfectionist confrontational difficult to handle desperate ramrod bad-mannered stable consistent permanent static hostile to averse to inimical to opposed to unfailing unquenchable undying ticklish puzzling baffling stony-hearted hard-shelled malapropos badly timed unseasonable scrappy distressing perturbing nagging perplexing sharp-witted clear-sighted shrewd smart canny savvy clear-eyed knowing astute everlasting enduring inextinguishable eternal unconstrained unfading unenthusiastic about fossilised steady changeless monolithic niggling maddening infuriating grievous onerous provocative bold misfortunate hapless luckless unpropitious unpleasant ill-starred star-crossed daring audacious sticky intricate catchy pestilential plaguy pestiferous arduous concerning harassing sassy gutsy disregardful cheeky dareful undue punishing punitive inordinate crippling bitter hardhanded imperishable lasting unremitting uncontainable indestructible disinclined to accept reluctant to accept unwilling to accept dead set against ready for a fight spoiling for a fight discomposing aggravating wearisome discomforting unsettling disquieting troublous troubling laborious never-changing problematical hairy mystifying exorbitant unconscionable swingeing towering excessive unmerciful searing murderous excruciating overweening steep pestilent unconcerned indifferent oblivious overextravagant extravagant insane plethoric baroque overmuch overdue inhuman dodgy spiny murder uphill painful infestive dangerous alarming damaging repressive messy level-headed rational logical businesslike sober sensible robust great unhearing unmoved by unconcerned with insensible to unaffected by unconscious of impervious to dispassionate about oblivious to deaf unresponsive to unaware untouched by indifferent to unaware of unmindful of unaffected heedless of to listen blind unswerving unflagging spirited committed dedicated vigorous untiring earnest undaunted unhesitating unshaken valiant settled gritty sturdy stout bound mettlesome sure perseverant courageous plucky rooted driven continuous stout-hearted brave continual full of determination abiding ingrained deep-rooted deep-seated continuing unabating emphatic fanatical serious spunky doughty lionhearted definite ineradicable entrenched zealous ceaseless true long-standing purposive chronic perpetual perennial unflappable persisting hardy sedulous manful unabated diligent hard-and-fast unvacillating ardent incessant devoted established tight confirmed long-lasting recurrent ironclad lifelong bulldog impliable deliberate endless inelastic unending patient deep-dyed bent on focused bent upon compulsive high-spirited indelible strenuous secure bent energetic certain fast concrete active habitual unqualified obsessive focussed faithful four-square hearty meaning business unbroken bound and determined never-failing toughened unmitigated routine recurring inborn long-lived ever-present usual inbred heavy-duty unceasing uninterrupted go-getting self-assertive do-or-die intrepid irremovable hell-bent on protracted hell-bent upon nonstop unrelieved ambitious interminable burning non-stop keen resilient enterprising enthusiastic motivated frozen industrious compact unfluctuating wholehearted avid inescapable eager seasoned aspiring non-flexible never-ending unmoving win-or-lose loyal regular explicit well-founded sound unswervable determinate inexpugnable winner-take-all zero-sum hard-wearing rock-solid out hard-driving self-starting self-confident fearless goal-oriented reinforced taut armoured armored self-driven lusty urgent immobile unfeeling unassailable fiery game important running continued powerful tense granite heroic exigent devout imperative hungry unwearied brittle obsessional all-or-nothing prolonged deep necessary unfriendly besetting intrenched thirsty desirous round-the-clock obsessed inspired unmodifiable striving solidified unsupple shatterproof positive independent monomaniacal irreversible vehement incorruptible cohesive clamant crying acute possessed non-breakable lingering haunting jelled reliable indissoluble assured high-powered bred-in-the-bone fixated well-established even uniform all-consuming final confident never-tiring inured hell bent on irresistible infrangible invulnerable hell-bent stiff as a board well-built well-set well-made made to last self-disciplined high-stake heartless firmly-based unshrinking direct petrified nonflexible reactionary traditionalist conservative long-drawn-out conscientious gallant unquestioning starched day-and-night impassive unplacatable iron-handed unmollifiable unpacifiable unblinking immoveable bony indurated rigidified perseverative ultra-conservative unprogressive cocksure valorous coherent pounding mortal hard-headed unimpressionable passionate hardworking hellbent straight trusty unintimidated dauntless possessive unforgetful ballsy ineluctable quiescent unsupportive neverending dragging slow flat compulsory complicated exact obscene pornographic X-rated iron-jawed undefeated preconceived immortal sagacious remaining true-blue set-on one-sided going all the way solid as a rock undiscouraged undeterred mean business thick-skinned scrupulous systematic meticulous painstaking set in concrete blimpish all out flat-out straight out tall in the saddle on one's mettle insistent on intent upon intent on set on determined to committed to the idea of numbed annealed formal as game as Ned Kelly rocklike manly greathearted gutty stouthearted unafraid undauntable heroical unwaivering no going back undismayed drawn-out spun-out firm in spirit perceptive keen as mustard animated tough-minded resourceful take charge fit nonperishable deathless inextensible inductile solemn lion-hearted unobliging like death and taxes decided upon writ in stone cut-and-dried strait-laced not put off not discouraged pass-fail high stakes reserved cynical never give up fogyish stick-in-the-mud conformist consumed compelled uncivil discourteous competitive unsmiling chilly frigid icy frosty nonstretchable dynamic red-blooded pushful peremptory distant not cooperative whole-hearted sacrosanct ageless cutthroat galvanized impelled triumphant progressive bloodthirsty pioneering tough as old boots rocky as tough as old boots louring gruff unvaried incommutable unchanged dominant in earnest nonmoving resounding reiterative monotonous prevailing non-stretchable unamiable uncongenial warlike gladiatorial induced safe chiseled chiselled remote lowering intimidating unbudging going irrefragable nonbreaking unwreckable undestroyable inextirpable inexterminable undestructable unruinable irrefrangible impregnable invincible nonmotile pushed steered guided galvanised mighty sombre somber ungentle self-asserting well-armed strengthened airtight storm-resistant fortified well protected flourishing unattackable bombproof dependable impenetrable stormproof tried-and-true knockabout well fortified inviolable well defended well-protected impassible full-blooded intensely competitive in-your-face self-seeking fiercely competitive get up and go stop at nothing power-hungry having killer instinct cut-throat dog-eat-dog hang-tough high-pressure go for broke self-assured can-do eager beaver power-loving gung ho high-reaching self-possessed potent immotile mean-looking influential thorough unbowed furious fixed as the laws of the Medes and Persians through-and-through fervent proved complete significant torrid thoroughgoing impenitent supreme unapologetic unashamed irredeemable unreformable longtime urged on forcible gripping tormenting neurotic consuming accustomed habituated staid stark dominating sicker strapping staying dateless oft-repeated repetitive timeless consecutive repeated around-the-clock unalleviated ongoing connected unwaning aeonian frequent long-established addictive fanatic controlling nonbreakable perdurable brass-bound hale athletic sinewy capable muscular big able substantial crucial compelling vital bona fide anchored puissant well established red-hot through and through deep-set firmly established card-carrying nailed quiet hitched hooked situated attached stationary still located pathological wackadoodle wackadoo without respite high-priority in fine feather able-bodied made fast preoccupied infatuated constraining instant pivotal emergent necessitous key essential clamouring persuasive clamoring requiring of the utmost importance of the essence hurry-up immediate obliging heat-on now or never claiming forcing

hardheaded astute canny clear-eyed clear-sighted hard-boiled heady knowing savvy sharp sharp-witted shrewd smart businesslike cool hard-bitten intractable level-headed logical no-nonsense rational resolute sensible sober tough unsentimental hang tough locked in stand pat acute discriminating wise clever intelligent perceptive discerning perspicacious sagacious judicious calculating ingenious pawky foxy heads-up sapient argute long-headed on the ball artful cunning keen crafty subtle quick-witted insightful sly streetwise brainy whip-smart penetrating wily quick prudent media-savvy intuitive suss sage slick cagey smooth farsighted bright alert piercing brilliant incisive cute fly observant careful slippery probing nimble-witted accurate far-seeing adroit quick off the mark quick on the uptake in the know not born yesterday politic razor-sharp experienced cautious circumspect sensitive ready apt nimble penetrative sussed percipient fine worldly-wise sharp as a tack keen-witted hep watchful skillful dexterous dextrous able discreet frugal wary skilful agile sound practical rapier-like searching exceptional acuminous fast supersmart ultrasmart hyperintelligent genius with it street smart as sharp as a tack having fancy footwork street-smart finely honed exact resourceful witty critical pragmatical cluey informed thoughtful provident reasonable sane well-advised pragmatic not missing a trick having smarts quick on the trigger knowing how many beans make five nobody's fool with all one's wits about one smart as a tack devious scheming guileful tricky designing beguiling underhand dodgy profound cagy deep disingenuous shark astucious inside calculated wised up on the inside up on on top of knowledgeable gifted adept deft expert masterly capable accomplished proficient educated skilled aware learned intellectual talented competent erudite crack good enlightened virtuoso scholarly practised precocious delicate masterful handy efficient polished ace practiced professional consummate master versed nifty cerebral seasoned understanding wizard vigilant great trained sophisticated inventive attentive open-eyed excellent whiz clear tasty active crackerjack mean precise awake cultured well versed veteran complete first-rate responsive compleat on guard on the lookout elite top-notch heedful well-informed wide awake tentie tenty quick-thinking cultivated professed Argus-eyed trenchant wicked analytical facile first-class tuned in alive on the qui vive on one's toes qualified gnostic all there conversant bravura refined wide-awake stellar analytic habile academic workmanlike conscious hardened creative reflective prompt on your toes bookish mindful on the alert a dab hand at on the job philosophical highbrow quick on the draw enquiring chary outstanding well read sharp-sighted spirited guarded schooled hot sharp-eyed well informed eagle-eyed keen-eyed hotshot inquisitive strong hawk-eyed downy well-read prepared worldly contemplative neat sharpened on tiptoe tactful thinking all ears inquiring sentient foresighted realistic lively reasoned literate imaginative strategic extraordinary effective full of insight tactical solid hip wired mature Machiavellian commonsensical with great knowledge razor-edged knife-like responsible magnificent well educated considerate impressive well-reasoned concentrating specialist well judged marvellous effectual diplomatic formidable regardful wakeful crisp nimble-fingered pro beady-eyed artistic exquisite au fait intent steely well-grounded there powerful on the watch with eyes like a hawk marvelous top-drawer bright-eyed and bushy-tailed immensely skilled highly qualified very skilled gimlet-eyed highly skilled exceptionally skilled with eyes peeled out of this world extraordinarily skilled thorough up to speed heads up highly trained big league selective lettered familiar acquainted insighted original tasteful sophic cognizant desirable questioning well-honed well-developed fastidious razor sharp enterprising brisk justified studious contriving conniving well-founded civilized apprised ratiocinative effortless instructed tutored expedient comprehending well advised down-to-earth well thought out certain showing great knowledge commonsense illuminated together razor-like phenomenal splendid scientific clean matter-of-fact hard coherent levelheaded commonsensible superior widely read sure versant intriguing remarkable philosophic eggheaded choice whip visionary class knows what's what no dummy certified au courant interested agog anxious leery flippant facetious pointed topflight ear to the ground genial just finely judged endowed deadly unsleeping very intelligent civilised well-rounded grounded old vet clued up mischievous well-thought-out Einstein having been around keeping a weather eye on things well-versed paying attention top-hole waiting on keeping one's eyes peeled on the beam tongue-in-cheek smart-alecky droll fast on the draw whiz kid highbrowed good hands humorous looking for whimsical with weather eye open looking to on alert smart-aleck class act shining at a hand at jocular superintelligent in-depth self-aware concise shady sneaky underhanded shifty einstein manipulative succinct punchy pithy bluestocking receptive sprightly straight decisive swift PDQ minute deliberated swotty streamlined plotting proper exacting detailed complex considered smooth-running teachable unscrupulous wise to superlative wonderful dazzling to the point vigorous mercurial curt star superb whetted mentally keen quick to learn fluent innovative cogitative no fool strict express categorical appreciative prescient nippy fit leading polite urbane unprovincial egghead gingerly premeditating slim safe leet supreme keeping one's eyes skinned with one's eyes open book smart drilled phenom well-organized well organized sharp-edged suspicious inspired inch-perfect advisable smart as a whip well-taught fleet heightened in one's best interests privy appraised literary cool-headed clear-thinking hooked glued with one's eyes skinned with your wits about you clued-in on the stick vital apprehensive recognizant clued dominant suitable fitted well reasoned judgmatical judgmatic innovational trailblazing fertile originative Promethean elaborate innovatory well run supremely skilled hard-nosed finely tuned smashing fab peerless efficacious pedantic esoteric recondite having good hands having know-how brill magic abreast witting finished pioneering A1 very able tip-top know one's stuff no slouch very good seasonable judicial common-sense seemly well-judged suited equal adequate donnish apperceptive hard-headed clued-up tuned-in fully developed arch treating with kid gloves gracious courteous opportunistic conciliatory bland suave very smart deviceful equipped easy observing dynamite with-it up to it highly endowed up to snuff know one's onions worthy know backwards and forwards know the ropes intense investigative examining exploratory researching curious with both feet on the ground ware posted well-educated polymath professorial abstruse omniscient solemn pansophic grave studied forward perky thinking outside the box having a knack for cut out for well versed know how many beans make five focused fully awake wide-eyed having a good head on one's shoulders having no flies on particular genned up balanced valid surveying deducing correct eager considering intentive discovering detecting contemplating focussed advertent observative specialized serious-minded firm consequent top-shelf have smarts advanced for one's age have the goods ahead of one's peers out of the ordinary old beyond one's years got it advanced specialised full of common sense discriminative having all one's marbles steady-going in one's right mind liberal discriminatory discriminational differential developed plausible justifiable veridical faultless collected unquestionable veracious deductive synthetic credible objective infallible trustable reasoning progressive aesthetic nice amusing snazzy snappy jocose entertaining funny racy risible comical slapstick scintillating glib teasing sparkling waggish ironic playful cutting mirthful rigorous substantiated secure confirmed errorless proven corroborated colorable meticulous truthful sincere impeccable cogent inerrant validated verified open-minded broad-minded choosy with good taste picky individualising opinionated individualizing choicy esthetic finical select eclectic persnickety fussy finicky jazzed hip to defensible maintainable definite defendable calculable explicit supportable tenable sustainable empirical cognitive open stringent empiric cheeky in the picture free-thinking knowing what's what plugged in sarcastic sassy psyched up switched on on-target letter-perfect clear-cut dead-on spot-on flip bantering smarty-pants bold jesting saucy fresh insolent brazen

tough nuts to crack tough nut to crack tough one tough out tough out it tough person tough noogies toughness of spirit toughnesses toughness tough-mindedly tough-minded