Not legally binding or legally effective; not
valid.
Merriam-Webster Online Dictionary
invalid (adjective) not valid
a) being without foundation or force in fact, truth, or law - an invalid assumption declared the will invalid
b) logically inconsequent
1.
suffering from disease or disability - sickly
2.
of, relating to, or suited to one that is sick - an invalid chair
one who is sickly or disabled
transitive verb
1.
to remove from active duty by reason of sickness or disability
2.
to make sickly or disabled
Merriam-Webster Online Thesaurus
invalid (adjective)chronically or repeatedly suffering from poor health
SYNONYMS:
ailing, invalid, weaklyRELATED WORDS:
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:
able-bodied, fit, hale, hearty, sound, well-conditioned, whole, wholesome1.
having no legal or binding force
SYNONYMS:
bad, inoperative, invalid, nonbinding, nonvalid, nugatory, null and void, voidRELATED WORDS:
illegal; useless, worthless; ineffective, ineffectualNEAR ANTONYMS:
legal; working2.
not being in agreement with what is true
SYNONYMS:
erroneous, inaccurate, incorrect, inexact, invalid, off, unsound, untrue, untruthful, wrongRELATED WORDS:
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:
confirmed, demonstrated, established, proven, tested; faultless, flawless, impeccable, letter-perfect, perfect3.
not using or following good reasoning
SYNONYMS:
fallacious, illegitimate, inconsequent, inconsequential, invalid, irrational, nonrational, unreasonable, unreasoning, unsound, weakRELATED WORDS:
eristic ( eristical), misleading, sophistic ( 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 ( whacky); disordered, disorganized, rambling, random; unconvincing; inexplicable, unaccountable, unexplainableNEAR ANTONYMS:
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, validated4.
having no basis in reason or fact
SYNONYMS:
baseless, foundationless, invalid, nonvalid, unfounded, unreasonable, unsubstantiated, unsupported, unwarrantedRELATED WORDS:
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 ( whacky)NEAR ANTONYMS:
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, sound
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