Толковый словарь английского языка Oxford English Reference - defective

adj. & n. --adj. 1 having a defect or defects; incomplete, imperfect, faulty. 2 mentally subnormal. 3 (usu. foll. by in) lacking, deficient. 4 Gram. not having all the usual inflections. --n. a mentally defective person. Derivatives defectively adv. defectiveness n. Etymology: ME f. OF defectif -ive or LL defectivus (as DEFECT)