invalid

chronically or repeatedly suffering from poor health an old and now invalid woman who rarely gets out anymore Synonyms of ¹invalid ailing, invalid, weaklyWords Related to ¹invalid bedfast, bedridden; delicate, fragile, frail; dying, fading, incurable, moribund; challenged, debilitated, incapacitated, lame; decrepit, enfeebled, feeble, infirm, weak, weakened, worn-out; ill, indisposed, peaked, poorly, run-down, sick, unhealthy, unsound, unwellNear Antonyms of ¹invalid able-bodied, fit, hale, hearty, sound, well-conditioned, whole, wholesomeAntonyms of ¹invalid healthy, well

1 having no legal or binding force the treaty is invalid once one side violates it Synonyms of ²invalid bad, inoperative, invalid, nonbinding, nonvalid, nugatory, null and void, voidWords Related to ²invalid illegal; useless, worthless; ineffective, ineffectualNear Antonyms of ²invalid legal; workingAntonyms of ²invalid binding, good, valid

2 not being in agreement with what is true that's an invalid assumption on your part Synonyms of ²invalid erroneous, inaccurate, incorrect, inexact, invalid, off, unsound, untrue, untruthful, wrongWords Related to ²invalid counterfactual; specious, spurious; deceptive, delusive, delusory, distorted, fallacious, fictitious, illusory, misleading; amiss, askew, awry; deceitful, dishonest, fraudulent, lying, mendacious; unconfirmed, unproven, untested; fabricated, invented, made-up, trumped-upNear Antonyms of ²invalid confirmed, demonstrated, established, proven, tested; faultless, flawless, impeccable, letter-perfect, perfectAntonyms of ²invalid accurate, correct, errorless, exact, factual, precise, proper, right, sound, true, valid, veracious

3 not using or following good reasoning an argument which has one untrue premise is invalid Synonyms of ²invalid fallacious, illegitimate, inconsequent, inconsequential, invalid, irrational, nonrational, unreasonable, unreasoning, unsound, weakWords Related to ²invalid eristic (also eristical), misleading, sophistic (or sophistical), specious; half-baked, ill-advised, misguided, unconsidered, unreasoned; inconsistent; absurd, asinine, foolish, meaningless, nonsensical, preposterous, reasonless, senseless, silly; Kafkaesque, odd, peculiar, strange, surreal, unusual, weird; insane, mad, nutty, wacky (also whacky); disordered, disorganized, rambling, random; unconvincing; inexplicable, unaccountable, unexplainableNear Antonyms of ²invalid commonsense, sane, sensible, sober, wise; enlightened, informed, just, justified, reasoned; ordered, organized; clear, cogent, compelling, convincing, credible, persuasive, plausible, satisfying, solid; certain, sure, true; confirmed, corroborated, demonstrated, established, substantiated, validatedAntonyms of ²invalid logical, rational, reasonable, sound, valid, well-founded, well-grounded

4 having no basis in reason or fact an invalid claim that can be easily disproved by the facts Synonyms of ²invalid baseless, foundationless, invalid, nonvalid, unfounded, unreasonable, unsubstantiated, unsupported, unwarrantedWords Related to ²invalid illogical, irrational, nonlogical, unconscionable, unsound; fallacious, false, misled, wrong; gratuitous, uncalled-for, unnecessary; flimsy, implausible, misleading, specious, unconvincing, untenable, weak; ill-advised, unreasoned; inconsistent; absurd, asinine, brainless, crackpot, crazy, fatuous, foolish, half-witted, harebrained, meaningless, nonsensical, preposterous, senseless, silly, simpleminded, stupid, unwise; insane, lunatic, mad, nutty, wacky (also whacky)Near Antonyms of ²invalid certified, validated, verified; confirmed, corroborated; informed, logical, rational; commonsense, sane, sensible, sober, wise; actual, genuine, real, true; certain, sure; clear, cogent, compelling, convincing, credible, persuasive, plausible, satisfying, solid, soundAntonyms of ²invalid good, hard, just, justified, reasonable, reasoned, substantiated, valid, well-founded, well-grounded