Jun 18, 2026 · 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.

A person who is very sick or injured and needs frequent care is an invalid. Also, something no longer current or useful is invalid. The main uses of this word have to do with people and things that don't …

May 17, 2026 · Adjective invalid (comparative more invalid, superlative most invalid) Not valid; not true, correct, acceptable, or appropriate. Synonyms: disallowed, nonvalid Antonym: valid Your argument is …

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 …

Jun 18, 2026 · The simple definition of INVALID is not valid: such as.

Learn the 3 key meanings of 'invalid' (adj.): not legally valid, logically flawed, and a chronically ill person. See clear examples, avoid common mistakes, and understand the difference between 'invalid' and …

1 invalid /ɪn ˈ væləd/ adjective Britannica Dictionary definition of INVALID : not valid: such as a : having no force or effect

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

The comprehensive definition of invalid. Includes pronunciation, synonyms, etymology, and usage examples to help you master this word.