invalid

Fetched 2026-10-28 (live).

Datamuse reports no synonyms or antonyms for this word.

Adjective

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.

Noun

1. Any person with a disability or illness.
2. 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. A disabled member of the armed forces; one unfit for active duty due to injury.

Adjective

1. Suffering from disability or illness.
2. Intended for use by an invalid.

Verb

1. To exempt from (often military) duty because of injury or ill health.
   • He was invalided home after the car crash.
2. To make invalid or affect with disease.

Source: Wiktionary · CC BY-SA 3.0 (Wiktionary) · cached copy, not a rewrite.