Not perfect; lacking completeness, correctness, or excellence; falling short of a standard or ideal; defective; incomplete: as, an imperfect copy of a book; imperfect vision.Characterized by or subject to defects; not completely good; frail; inadequate.In gram., designating incomplete or continuous action, or action or condition conceived as in process when something else takes place, as in Latin amabat, French aimait, Greek ε%27λνε, as distinguished from the simple past forms (aoristic), without further implication, amavit, aima, ε%27λνσε.In music. See the phrases below.Unjust; unfair.Weak, erring.n. In grammar, an imperfect tense; a past continuous tense.To render imperfect.