invalid
[adjective]
Synonyms:
- disabled, ailing, bedridden, frail, ill, infirm, sick
[noun]
Synonyms:
- patient, convalescent, valetudinarian
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[adjective]
null and void, fallacious, false, illogical, inoperative, irrational, unfounded, unsound, void, worthless

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Antonyms: valid

[TahlilGaran] English Synonym Dictionary ▲

I. in‧val‧id¹ /ɪnˈvæləd, ɪnˈvælɪd/ adjective
[Word Family: verb: validate ≠ invalidate; noun: validity ≠ invalidity; adjective: valid ≠ invalid]
[Date: 1500-1600; Language: Latin; Origin: invalidus, from validus; ⇒ valid]

1. a contract, ticket, claim etc that is invalid is not legally or officially acceptable Antonym : 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 good judgment Antonym : valid

3. if something you type into a computer is invalid, the computer does not recognize or accept it:
Filename in invalid format.

[TahlilGaran] Dictionary of Contemporary English ▲

II. in‧va‧lid² /ˈɪnvəliːd, -ləd $ -ləd/ noun [countable]
[Date: 1600-1700; Language: French; Origin: invalide, from Latin invalidus; ⇒ invalid¹]
someone who cannot look after themselves because of illness, old age, or injury:
I resented being treated as an invalid.
—invalid adjective [only before noun]

[TahlilGaran] Dictionary of Contemporary English ▲

III. in‧va‧lid³ verb
be invalided out (also be invalided home) phrasal verb British English
to have to leave the army, navy etc because you are ill or injured

[TahlilGaran] Dictionary of Contemporary English ▲

invalid
adj.
VERBS be | became | make sth, render sth This action would render the agreement invalid.
consider sth, declare sth, deem sth, regard sth as The contract was declared invalid.

[TahlilGaran] Collocations Dictionary ▲