Invalid — Meaning, Definition & Synonyms

adjective noun verb /(ˌ)in-ˈva-ləd/ (adjective) /ˈin-və-ləd/ (noun) in·val·id

Meaning & Definition of Invalid

Invalid (adjective)

  1. not valid:
  2. being without foundation or force in fact, truth, or law
  3. logically inconsequent
  4. affected by disease or disability, sickly
  5. of, relating to, or suited to one that is sick

Invalid (noun)

  1. one who is sickly or disabled

Invalid (verb)

  1. to remove from active duty by reason of sickness or disability
  2. to make sickly or disabled

Invalid (adjective) — Senses, Synonyms & Antonyms

  1. chronically or repeatedly suffering from poor health

    "an old and now invalid woman who rarely gets out anymore"

    similar: ailing, sickly, weakly
    related: bedfast, bedridden, delicate, fragile, frail, dying, fading, incurable, moribund, debilitated, incapacitated, decrepit, enfeebled, feeble, infirm, weak, weakened, worn-out, ill, indisposed, peaked, poorly, run-down, sick, unhealthy, unsound, unwell
    opposite: healthy, well
    near: able-bodied, fit, hale, hearty, sound, well-conditioned, whole, wholesome

  2. having no legal or binding force

    "the treaty is invalid once one side violates it"

    similar: bad, inoperative, nonbinding, nonvalid, nugatory, null, null and void, void
    related: illegal, useless, worthless, ineffective, ineffectual
    opposite: binding, good, valid
    near: legal, working

  3. not being in agreement with what is true

    "that's an invalid assumption on your part"

    similar: erroneous, false, inaccurate, incorrect, inexact, off, unsound, untrue, untruthful, wrong, off base
    related: 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-up
    opposite: accurate, correct, errorless, exact, factual, precise, proper, right, sound, true, valid, veracious
    near: confirmed, demonstrated, established, proven, tested, faultless, flawless, impeccable, letter-perfect, perfect

  4. not using or following good reasoning

    "an argument which has one untrue premise is invalid"

    similar: fallacious, illegitimate, illogical, inconsequent, inconsequential, irrational, nonrational, unreasonable, unreasoning, unsound, weak
    related: eristic, misleading, sophistic, 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, disordered, disorganized, rambling, random, unconvincing, inexplicable, unaccountable, unexplainable
    opposite: logical, rational, reasonable, sound, valid, well-founded, well-grounded
    near: 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, validated

  5. having no basis in reason or fact

    "an invalid claim that can be easily disproved by the facts"

    similar: baseless, foundationless, groundless, nonvalid, unfounded, unreasonable, unsubstantiated, unsupported, unwarranted
    related: 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, mad, nutty, wacky
    opposite: good, hard, just, justified, reasonable, reasoned, substantiated, valid, well-founded, well-grounded
    near: 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

Invalid (verb) — Senses, Synonyms & Antonyms

  1. as in injure, hurt

    similar: damage, harm, hurt, impair, injure, lay up, deplete, depress, exhaust, impoverish, unman, wash out, break down, grind (down), wear down, wear out, cripple, disable, hamstring, incapacitate, paralyze, debilitate, devitalize, enervate, enfeeble, etiolate, prostrate, sap, soften, tire, waste, weaken
    opposite: beef (up), fortify, strengthen, energize, invigorate, recruit, rejuvenate, vitalize, harden, season, toughen

Synonyms, Thesaurus & Another Word for Invalid

The most common words with a similar meaning to Invalid:

ailing, sickly, weakly, bad, inoperative, nonbinding, nonvalid, nugatory, null, null and void, void, erroneous, false, inaccurate, incorrect, inexact, off, unsound, untrue, untruthful, wrong, fallacious, illegitimate, illogical, inconsequent, inconsequential, irrational, nonrational, unreasonable, unreasoning, weak, baseless, foundationless, groundless, unfounded, unsubstantiated, unsupported, unwarranted, off base, damage

Antonyms & Opposite Words for Invalid

Words with the opposite meaning of Invalid:

healthy, well, binding, good, valid, accurate, correct, errorless, exact, factual, precise, proper, right, sound, true, veracious, logical, rational, reasonable, well-founded, well-grounded, hard, just, justified, reasoned, substantiated, beef (up), fortify, strengthen, energize

Related Words for Invalid

bedfast, bedridden, delicate, fragile, frail, dying, fading, incurable, moribund, debilitated, incapacitated, decrepit, enfeebled, feeble, infirm, weakened, worn-out, ill, indisposed, peaked, poorly, run-down, sick, unhealthy, unwell, illegal, useless, worthless, ineffective, ineffectual

Near Antonyms of Invalid

able-bodied, fit, hale, hearty, well-conditioned, whole, wholesome, legal, working, confirmed, demonstrated, established, proven, tested, faultless, flawless, impeccable, letter-perfect, perfect, commonsense, sane, sensible, sober, wise, enlightened, informed, ordered, organized, clear, cogent

Word Forms of Invalid

Inflections: invalided, invaliding, invalids

Derived words: invalidly (adverb)

Origin & Etymology of Invalid

Latin invalidus weak, from in- + validus strong valid

First known use: 1542

Frequently Asked Questions about Invalid

What does "Invalid" mean?

"Invalid" means not valid:. As an an adjective, a noun and a verb, it is defined as: not valid:. It has 6 distinct senses.

What is another word for "Invalid"?

Other words for "Invalid" include ailing, sickly, weakly, bad, inoperative, nonbinding, nonvalid and nugatory. The best synonym depends on which meaning of "Invalid" you intend.

What are different ways to say "Invalid"?

There are 180 words and phrases with a similar meaning to "Invalid". Common alternatives include ailing, sickly, weakly, bad, inoperative, nonbinding, nonvalid, nugatory, null and null and void.

What is the opposite of "Invalid"?

Antonyms of "Invalid" include healthy, well, binding, good, valid, accurate, correct and errorless. Near antonyms include able-bodied, fit, hale and hearty.

How do you use "Invalid" in a sentence?

Examples of "Invalid" in a sentence: "an old and now invalid woman who rarely gets out anymore"; "the treaty is invalid once one side violates it"; "that's an invalid assumption on your part".

Is "Invalid" a noun, verb, or adjective?

"Invalid" can be used as an adjective, a noun and a verb, depending on the context.

How do you pronounce "Invalid"?

"Invalid" is pronounced /(ˌ)in-ˈva-ləd/ as an adjective and /ˈin-və-ləd/ as a noun and divided into syllables as in·val·id.

What is the origin of the word "Invalid"?

"Invalid" comes from Latin invalidus weak, from in- + validus strong valid. First known use: 1542.