invalid

Adjective (1)

invalid (comparative more invalid, superlative most invalid)

1. 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:

   disallowed, nonvalid

   Antonyms:

   valid

Noun

IPA/ˈɪn.və.lɪd/

invalid (plural invalids)

1. (dated, offensive, sometimes) Any person with a disability or illness.
2. (dated, offensive, sometimes) A person who is confined to home or bed because of illness, disability or injury; one who is too sick or weak to care for themselves.
3. (archaic) A disabled member of the armed forces; one unfit for active duty due to injury.

Adjective (2)

IPA/ˈɪn.və.lɪd/

invalid (not comparable)

1. Suffering from disability or illness.
   • Invalidism therefore referred to a lack of power as well as a tendency toward illness. It is for this reason that I choose to discuss the invalid woman rather than just the ill one.2000, Diane Price Herndl, Invalid Women: Figuring Feminine Illness in American Fiction and Culture, 1840-1940, University of North Carolina Press, →ISBN, page 1
2. Intended for use by an invalid.

Verb

IPA/ˈɪn.və.lɪd/

invalid (third-person singular simple present invalids, present participle invaliding, simple past and past participle invalided)

1. (UK, transitive) To exempt from (often military) duty because of injury or ill health.
   • He was invalided home after the car crash.
   • [Blackadder:] Right, Baldrick, this is an old trick I picked up in the Sudan. We tell HQ that I’ve gone insane, and I’ll be invalided back to Blighty before you can say "wibble" — a poor, gormless idiot.1989 November 2, Richard Curtis, Ben Elton, “Goodbyeee”, in Blackadder Goes Forth
2. (transitive) To make invalid or affect with disease.