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Definition of Invalid


  1. Of no force, weight, or cogency; not valid; weak.
  2. Having no force, effect, or efficacy; void; null; as, an invalid contract or agreement.
  3. A person who is weak and infirm; one who is disabled for active service; especially, one in chronic ill health.
  4. Not well; feeble; infirm; sickly; as, he had an invalid daughter.
  5. To make or render invalid or infirm.
  6. To classify or enroll as an invalid.
More "Invalid" Quotations

Invalid Translations

invalid in Italian is nullo
invalid in Latin is inritus irritus
invalid in Swedish is ogiltig