Synonym of unsustainable

Adjective

(especially of a position or view) Not able to be maintained or defended against attack or objection
untenable indefensible flawed shaky unsound weak insupportable groundless refutable unarguable undefendable unjustified defective flimsy ill-founded illogical inadmissible invalid unjustifiable unwarranted absurd baseless faulty implausible irrational specious unfounded unreasonable fallacious preposterous senseless unacceptable unconvincing false inadequate unsubstantiated wrong spurious nonrational inconsequent illegitimate inconsequential unreasoning unreasoned full of holes unwarrantable inexcusable unforgivable unpardonable inexpiable arbitrary bad uncalled-for untrue inaccurate unscientific untruthful inexact out incorrect inconsistent off foundationless nonvalid erroneous unsupported bogus off target wrongly inferred mad off beam illegal reasonless sophistic wide of the mark way out not working questionable tenuous vague improbable dubious unpersuasive unbelievable nonsensical poor unsatisfactory unlikely inconclusive suspect far-fetched contradictory feeble nebulous incredible doubtful ludicrous farfetched lame incongruous hollow sketchy unsupportable inconceivable irreconcilable puzzling obscure impossible fishy fantastic reachy vain pathetic airy fatuous nutty unimpressive thin wacky slight problematic off the wall won't hold water won't wash self-contradictory unsubstantial uncertain iffy unreliable dodgy paltry ridiculous shallow trifling silly insufficient unimaginable unthinkable fallible debatable stupid incoherent half-baked open to question open to doubt ineffectual undependable idiotic hard to swallow fantastical incredulous uncompelling fragile daft insignificant unconceivable transparent unclear remote ungrounded insubstantial frail imprecise without foundation foolish crazy trivial fanciful inane brainless without basis equivocal flakey insane flaky phony negligible imbecilic unconfirmed uncorroborated hard to believe beyond belief phoney ill-considered ill-defined kooky full of it frivolous slim harebrained superficial controvertible indefinite mistaken unsuccessful disputable flat unintelligent imperfect witless unwise unstable untrustworthy speculative dubitable indistinct injudicious sham light moronic confused asinine loony cock-and-bull too much cockamamie scarcely credible for the birds tame ineffective difficult to believe faint inept hazy chancy risky rocky disreputable outside small distant puerile deceptive futile vapid indeterminate unbacked arguable distorted wishful casuistic dicey unrealistic conjectural disjointed slender minute amiss contemptible assailable weakly meaningless mindless unestablished laboured impaired pseudo ambiguous faltering doubtable strained unsure controversial suspicious forced unsettled dotty laughable thoughtless off-target incomprehensible imprudent staggering perverse mind-boggling barmy problematical shady queer not likely vacant indiscreet suppositive suppositious zany incautious labored unimagined strange unintelligible far out extraordinary indecisive dim cockeyed screwy perplexing incogitable mind-blowing rare hesitant in doubt shadowy lunatic dippy daffy jerky short-sighted ill-advised half-witted nerdy doltish unearthly softheaded beyond the bounds of possibility feebleminded tomfool simple insecure without justification unspecific threadbare tiny unsafe contrived inauthentic minimal meagre meager contentious borderline tall unplausible wrongly deduced minuscule exiguous weak-kneed lacking substance puny unthinking issuable moot sophistical useless fruitless profitless ponderous feeble-minded unproved untested unverified negotiable astonishing amazing wild irrelevant unconnected outlandish unreal cock and bull unattested unproven enigmatic blurred reaching infeasible unapt inefficient flabby unpleasing unsuitable subject to debate open to debate open to suspicion eye-popping scatterbrained lamebrained past belief jaw-dropping demented off-the-wall freaky distraught raving aberrant disconnected delirious presumed assumed not validated not following hard to take not convincing slim and none not expected outside chance unheard of impracticable hundred-to-one not making sense woolly bleary foggy cloudy falsified fake purposeless unheard-of unknowable wooly fuzzy not reliable not dependable not backed up by evidence erratic loose capricious bad-tempered stroppy quirky empty out of the question imcomprehensible insupposable ill-tempered hesitating halting vacuous extremely implausible extremely unlikely extremely doubtful worthless loopy cockamamy not to be thought of beyond reason won't fly extremely difficult to believe not in the least likely all wet cretinous pointless risible stuttering stammering inarticulate casual minor petty unimportant shoestring inconsiderable full of hot air empty-headed goofy gormless infantile dumb damfool divvy childish insincere dof glaikit insipid crass wishy-washy immature innocuous sappy hypocritical artificial cynical garbled stumbling devoid of intelligence deceitful feigned pretended inexplicit debased rank unretentive unfit adulterated awry lemon sick malformed injured tainted blamable broken-down warped marred botched blemished incomplete cracked leaky deficient maimed pretend dissimulating dissembling counterfeit unpredictable unforeseeable indistinguishable unresolved incalculable cryptic arcane abstruse undetermined undefined mysterious mumbled muttered broken poorly spoken treacherous undecided unknown confusing muffled double-dealing devoid of validity two-faced hollow-hearted faithless intangible indiscernible wavering irresolute equivocating elusive vacillating below par up in the air in the balance

Adjective

Incapable of being helped

Antonym of unsustainable

unsustainable Idiom, Proverb

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