DEFECTIVE

adj. 1 imperfect, faulty, flawed, deficient, broken, out of order, impaired, marred, Colloq on the blink, US on the fritz The brakes on his car were defective 2 retarded, simple, feeble-minded, (mentally) deficient or incompetent, backward, subnormal, Brit education ESN ('educationally subnormal'), US education exceptional Found to be defective, he could not stand trial