invalid.
Not valid; not true, correct, acceptable, or appropriate.
Meaning & usage
Not valid; not true, correct, acceptable, or appropriate.
Your argument is invalid because it uses circular reasoning.
This invalid contract cannot be legally enforced.
Where this word comes from
Etymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Italic *n̥- Latin in-bor. Middle English in- English in- Proto-Indo-European *h₂welh₁- Proto-Indo-European *-éh₁ti Proto-Indo-European *-yeti Proto-Indo-European *-éh₁yeti Proto-Indo-European *h₂wl̥h₁éh₁yeti Proto-Italic *walēō Latin valeō Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin validusder. Middle French validebor. English valid English invalid From in- + valid.
Any person with a disability or illness.
A person who is confined to home or bed because of illness, disability or injury; one who is too sick or weak to care for themselves.
A disabled member of the armed forces; one unfit for active duty due to injury.
Where this word comes from
Etymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Italic *n̥- Latin in- Proto-Indo-European *h₂welh₁- Proto-Indo-European *-éh₁ti Proto-Indo-European *-yeti Proto-Indo-European *-éh₁yeti Proto-Indo-European *h₂wl̥h₁éh₁yeti Proto-Italic *walēō Latin valeō Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin validus Latin invalidusbor. Middle French invalidebor. English invalid Borrowed from Middle French invalide, from Latin invalidus (“infirm, weak”), from in- (“not”) + validus (“strong”).
Suffering from disability or illness.
Intended for use by an invalid.
Where this word comes from
Etymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Italic *n̥- Latin in- Proto-Indo-European *h₂welh₁- Proto-Indo-European *-éh₁ti Proto-Indo-European *-yeti Proto-Indo-European *-éh₁yeti Proto-Indo-European *h₂wl̥h₁éh₁yeti Proto-Italic *walēō Latin valeō Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin validus Latin invalidusbor. Middle French invalidebor. English invalid Borrowed from Middle French invalide, from Latin invalidus (“infirm, weak”), from in- (“not”) + validus (“strong”).
To exempt from (often military) duty because of injury or ill health.
He was invalided home after the car crash.
To make invalid or affect with disease.
Where this word comes from
Etymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Italic *n̥- Latin in- Proto-Indo-European *h₂welh₁- Proto-Indo-European *-éh₁ti Proto-Indo-European *-yeti Proto-Indo-European *-éh₁yeti Proto-Indo-European *h₂wl̥h₁éh₁yeti Proto-Italic *walēō Latin valeō Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin validus Latin invalidusbor. Middle French invalidebor. English invalid Borrowed from Middle French invalide, from Latin invalidus (“infirm, weak”), from in- (“not”) + validus (“strong”).
Try it on your idea.
invalid has 7 characters. Say it out loud, try it alongside a description of your project, and see whether its meaning fits what you want to create.
These are naming prompts. Meanings and pronunciation can vary; existing brand and domain uses have not been checked.
Explore the name generatorA word with a source.
Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.