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. defectively adv. defectiveness n.
[ ME f. OF defectif -ive or LL defectivus (as DEFECT) ]