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 …

Sep 22, 2025 · 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 invalid …

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

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

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 service.

The judge declared that the contract was invalid. 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.

You treat me like an invalid or a child. He was returned, but the election was declared invalid. A fall from his horse in 1845 made him a hopeless invalid, and completely removed him from public life. She is …