invalid

noun

(dated, sometimes offensive) Any person with a disability or illness.

(dated, sometimes offensive) 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.

(archaic) A disabled member of the armed forces; one unfit for active duty due to injury.

verb

(British, transitive) To exempt from (often military) duty because of injury or ill health.

(transitive) To make invalid or affect with disease.

adjective

Not valid; not true, correct, acceptable or appropriate.

Suffering from disability or illness.

Intended for use by an invalid.

Roots

inin- · Latin · not valeo-val · Latin · be strong, be worth

Synonyms for invalid

disablev incapacitatev incorrectadj annulledv nugatoryadj inoperativeadj revokedv fallaciousadj unavailingadj unsoundadj

Synonyms & related words for invalid

Find synonyms, related words, and the definition of invalid — including disable, incapacitate, incorrect, annulled, nugatory, inoperative. Dendril is a free visual thesaurus that shows them on an interactive map where stronger matches sit closer to the center — no signup, no ads.

Words related to invalid

Explore words related to invalid — words associated with it, words that go with it, and its nearest matches in meaning. Related words include invalidated, invalidly, invalidism, invalidator, valid, null, invalidity, invalidates. Click any word to make it the center of the map and keep exploring the web of connections.

Synonyms for invalid

Common synonyms for invalid include disable, incapacitate, incorrect, annulled, nugatory, inoperative, revoked, fallacious — words that share a close meaning. Hover or tap any word on the map for its definition and part of speech.

Where does invalid come from?

The word invalid breaks down into 2 roots of Latin origin: in-, from Latin in (“not”); and -val, from Latin valeo (“be strong, be worth”). Explore each root to see other English words built from the same source.