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.

1. an infirm or sickly person, esp. one who is too sick or weak to care for himself or herself. 2. unable to care for oneself due to infirmity or disability. 3. of or for invalids. 4. to make an …

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 …

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 …

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

• For this reason, you can readily identify them as valid or invalid. • But the vote has been declared invalid because fewer than half the parents took part in the ballot.

noun an infirm or sickly person. a person who is too sick or weak to take care of their own needs. My father was an invalid the last ten years of his life. Archaic., a member of the armed forces …

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 …

invalid: Not valid; of no force, weight, or cogency; weak.