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1. Dictionary

   In·val·id

   /inˈvaləd/

   

   adjective

   • 1. (of an official document or procedure) not legally recognized and therefore void because contravening a regulation or law: "the will was declared invalid and the children were entitled to the estate" Similar voidlegally voidnullnull and voidunenforceablenot bindinginoperativeworthlessillegitimateincorrectimproperunacceptableinapplicableannullednullifiedcanceledrevokedrescindedabolishedrepealedOpposite validbinding
   • ▪ (especially of an argument, statement, or theory) not true because based on erroneous information or unsound reasoning: "a comparison is invalid if we are not comparing like with like" Similar falseuntrueinaccuratefaultyfallaciousspuriousinadequateunconvincingunsoundweakwrongwrongly inferredwide of the markoff targetunjustifiedunsubstantiatedunwarranteduntenablebaselessill-foundedunfoundedgroundlessillogicalirrationalunscientificabsurdpreposterousinconsistentinformal:off beamoutway outfull of holesbogusOpposite trueaccurate
   • ▪ (of computer instructions, data, etc.) not conforming to the correct format or specifications.

   Word Origin mid 16th century (earlier than valid): from Latin invalidus, from in- ‘not’ + validus ‘strong’ (see valid).

   Derivatives

   • 1. invalidly adverb

   Scrabble Points: 11

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2. www.vocabulary.com › dictionary › invalidInvalid - Definition, Meaning & Synonyms | Vocabulary.com

   www.vocabulary.com › dictionary › invalid

   Definitions of invalid. adjective. no longer valid. “the license is invalid ” synonyms: expired. having come to an end or become void after passage of a period of time. adjective. having no cogency or legal force. “ invalid reasoning” “an invalid driver's license” synonyms: illegitimate. of marriages and offspring; not recognized as lawful.

3. dictionary.cambridge.org › us › dictionaryINVALID | definition in the Cambridge Learner’s Dictionary

   dictionary.cambridge.org › us › dictionary

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   Definition of invalid – Learner’s Dictionary. invalid. noun [ C ] uk / ˈɪnvəlɪd / us. Add to word list. someone who is so sick that they have to be looked after by other people. invalid. adjective. uk / ɪnˈvælɪd / us. invalid adjective (NOT ACCEPTABLE) An invalid document, ticket, law, etc is not legally or officially acceptable.

4. www.collinsdictionary.com › dictionary › englishINVALID definition and meaning | Collins English Dictionary

   www.collinsdictionary.com › dictionary › english

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   2 days ago · 1. countable noun. An invalid is someone who needs to be cared for because they have an illness or disability . I hate being treated as an invalid. Synonyms: patient, sufferer, convalescent, valetudinarian More Synonyms of invalid. 2. adjective.

5. www.oxfordlearnersdictionaries.com › us › definitioninvalid adjective - Definition, pictures, pronunciation and usage...

   www.oxfordlearnersdictionaries.com › us › definition

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   Definition of invalid adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

6. www.thefreedictionary.com › invalidInvalid - definition of invalid by The Free Dictionary

   www.thefreedictionary.com › invalid

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   1. Not legally or factually valid; null: an invalid license. 2. Falsely based or reasoned; faulty: an invalid argument. [Latin invalidus, weak : in-, not; see in-1 + validus, strong (from valēre, to be strong; see wal- in Indo-European roots ).] in′va·lid′i·ty (-və-lĭd′ĭ-tē) n. in·val′id·ly adv.

7. en.wiktionary.org › wiki › invalidinvalid - Wiktionary, the free dictionary

   en.wiktionary.org › wiki › invalid

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   May 2, 2024 · invalid (comparative more invalid, superlative most invalid) Not valid; not true, correct, acceptable or appropriate. Your argument is invalid because it uses circular reasoning. This invalid contract cannot be legally enforced. Synonyms [edit] nonvalid; disallowed; Antonyms [edit] valid; Translations [edit]

8. www.wordreference.com › definition › invalidinvalid - WordReference.com Dictionary of English

   www.wordreference.com › definition › invalid

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   an infirm or sickly person. a person who is too sick or weak to care for himself or herself: My father was an invalid the last ten years of his life. [ Archaic.]a member of the armed forces disabled for active service. adj. unable to care for oneself due to infirmity or disability: his invalid sister. of or for invalids: invalid diets.