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1. Dictionary

   invalid

   /ɪnˈvalɪd/

   adjective

   • 1. (of an official document or procedure) not legally recognized because it contravenes a regulation or law: "the will was declared invalid and the children were entitled to the estate" Similar voidlegally voidnullnull and voidunenforceablenot bindinginoperativeworthlessillegitimateincorrectimproperunacceptableinapplicableannullednullifiedcancelledrevokedrescindedabolishedrepealedOpposite 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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   INVALID definition: 1. An invalid document, ticket, law, etc. is not legally or officially acceptable: 2. An invalid…. Learn more.

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.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:

5. 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.

6. 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 ...

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

   www.thefreedictionary.com › invalid

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   adj. suffering from or disabled by injury, sickness, etc. vb ( tr) 1. to cause to become an invalid; disable. 2. ( usually foll by out; often passive) chiefly Brit to require (a member of the armed forces) to retire from active service through wounds or illness.

8. 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.

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

    www.ldoceonline.com › dictionary › invalid

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    From Longman Dictionary of Contemporary English in‧val‧id1 /ɪnˈvælɪd/ adjective 1 a contract, ticket, claim etc that is invalid is not legally or officially acceptable OPP valid Without the right date stamped on it, your ticket will be invalid. 2 an argument, reason etc that is invalid is not based on true facts or clear ideas, and lacks goo...

11. 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.