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

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. …

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

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 …

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 …

Definition of invalid adjective from the Oxford Advanced Learner's Dictionary. not legally or officially acceptable. The treaty was declared invalid because it had not been ratified. People …

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

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 …

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.

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