The meaning of INVALID is not valid. How to use invalid in a sentence.

INVALID definition: 1. An invalid document, ticket, law, etc. is not legally or officially acceptable: 2. An invalid…. Learn more.

Define invalid. invalid synonyms, invalid pronunciation, invalid translation, English dictionary definition of invalid. n. One who is incapacitated by a chronic illness or disability. adj. 1. Incapacitated by illness …

If an action, procedure, or document is invalid, it cannot be accepted, because it breaks the law or some official rule. The trial was stopped and the results declared invalid. We cannot accept liability if you …

Jan 14, 2026 · Adjective 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 …

an infirm or sickly person. a person who is too sick or weak to care for himself or herself: My father was an invalid the last ten years of his life. [Archaic.]a member of the armed forces disabled for active …

INVALID definition: an infirm or sickly person. See examples of invalid used in a sentence.

invalid definition: not legally or logically acceptable. Check meanings, examples, usage tips, pronunciation, domains, and related words. Discover expressions like "invalid carriage".

Her husband has become an invalid. She cares for her invalid husband at home. He was invalided out of the army. He was invalided home.

Definition of invalid adjective in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.