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.

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 …

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. …

Sep 22, 2025 · Adjective invalid (comparative more invalid, superlative most invalid) Not valid; not true, correct, acceptable or appropriate. Your argument is invalid because it uses circular …

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.

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

Invalid may refer to: Patient, a sick person one who is confined to home or bed because of illness, disability or injury (sometimes considered a politically incorrect term) Invalid (film), a 2023 …

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

1. Not legally or factually valid; null: an invalid license. 2. Falsely based or reasoned; faulty: an invalid argument.