1. invalid - Noun
2. invalid - Adjective
3. invalid - Verb
4. invalid - Adjective Satellite
Of no force, weight, or cogency; not valid; weak.
Having no force, effect, or efficacy; void; null; as, an invalid contract or agreement.
A person who is weak and infirm; one who is disabled for active service; especially, one in chronic ill health.
Not well; feeble; infirm; sickly; as, he had an invalid daughter.
To make or render invalid or infirm.
To classify or enroll as an invalid.
Source: Webster's dictionaryI have invented an invaluable permanent invalid called Bunbury, in order that I may be able to go down into the country whenever I choose. Oscar Wilde
It is not faith per se that creates the problem; it is conviction, the notion that one cannot be wrong, that opposing views are necessarily invalid and may even be intolerable. Jack McDevitt
The invalid assumption that correlation implies cause is probably among the two or three most serious and common errors of human reasoning. Stephen Jay Gould
The critique of the highest values hitherto does not simply refute them or declare them invalid. It is rather a matter of displaying their origins as impositions which must affirm precisely what ought to be negated by the values established. Martin Heidegger
Every invalid is a doctor. Irish Proverb
Every invalid is a physician. Irish Proverb