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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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   More definitions, origin and scrabble points

2. dictionary.cambridge.org › dictionary › englishINVALID | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › dictionary › english

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   An invalid document, ticket, law, etc. is not legally or officially acceptable: I'm afraid your driving licence is invalid in Eastern Europe. An invalid opinion, argument, etc. is not correct, usually because it is not logical or not based on correct information: an invalid argument.

3. www.merriam-webster.com › dictionary › invalidInvalid Definition & Meaning - Merriam-Webster

   www.merriam-webster.com › dictionary › invalid

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   The meaning of INVALID is not valid. How to use invalid in a sentence. not valid:; being without foundation or force in fact, truth, or law; logically inconsequent…

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

   www.collinsdictionary.com › dictionary › english

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   An invalid is someone who is very ill or disabled and needs to be cared for by someone else.

5. www.dictionary.com › browse › invalidINVALID Definition & Meaning | Dictionary.com

   www.dictionary.com › browse › invalid

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   not valid; not founded in truth, fact, or logic, and hence weak and indefensible; unsound; untenable: The entire argument depends on an invalid assumption. Synonyms: incorrect, inaccurate, false, erroneous, unsubstantiated, unfounded, groundless, baseless. deficient in effectiveness; inadequate:

6. dictionary.cambridge.org › dictionary › learner-englishINVALID | meaning - Cambridge Learner's Dictionary

   dictionary.cambridge.org › dictionary › learner-english

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   INVALID definition: 1. someone who is so sick that they have to be looked after by other people 2. An invalid document…. Learn more.

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

   www.thefreedictionary.com › invalid

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   Define invalid. invalid synonyms, invalid pronunciation, invalid translation, English dictionary definition of invalid. n. One who is incapacitated by a chronic illness or disability. adj. 1. Incapacitated by illness or injury. 2. Of, relating to, or intended for invalids....

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

   www.vocabulary.com › dictionary › invalid

   A person who is very sick or injured and needs frequent care is an invalid. Also, something no longer current or useful is invalid. The main uses of this word have to do with people and things that don't work very well anymore. A driver's license that has expired is invalid — it needs to be renewed. If you lost your health insurance, it's ...

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

   en.wiktionary.org › wiki › invalid

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   Jun 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.

10. www.yourdictionary.com › invalidInvalid Definition & Meaning | YourDictionary

    www.yourdictionary.com › invalid

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    noun. invalids. A weak, sickly person; esp., one who is chronically ill or disabled. Webster's New World. Similar definitions. Synonyms: weak. void. useless. unreasonable. unfounded. sickly. null. infirm. ineffective. feeble. cripple. valetudinarian. worthless. shut in. bed case. adjective. Incapacitated by illness or injury.

11. www.ldoceonline.com › dictionary › invalidinvalid | meaning of invalid in Longman Dictionary of...

    www.ldoceonline.com › dictionary › invalid

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    invalid meaning, definition, what is invalid: a contract, ticket, claim etc that is in...: Learn more.