not perfect; not complete in all its parts; wanting a part; deective; deficient.-wanting in some elementary organ that is essential to successful or normal activity.-not fulfilling its design; not realizing an ideal; not conformed to a standard or rule; not satisfying the taste or conscience; esthetically or morally defective.-the imperfect tense; or the form of a verb denoting the imperfect tense.-to make imperfect.