invalida.[Pref. in- not + valid: cf. F. invalide, L. invalidus infirm, weak. Cf. Invalid infirm.]()1. Of no force, weight, or cogency; not valid; weak.()2. (Law) Having no force, effect, or efficacy; void; null; as, an invalid contract or agreement.()n.[F. invalide, n. & a., L. invalidus, a. See Invalid null.] A person who is weak and infirm; one who is disabled for active service; especially, one in chronic ill health who is unable to care for himself.()a.[See Invalid, n.] Not well; feeble; infirm; sickly; as, he had an invalid daughter.()v. t.1. To make or render invalid or infirm.(Dickens.)2. To classify or enroll as an invalid.()Peace coming, he was invalided on half pay. (Carlyle.)