defective
/dɪˈfektɪv; dɪ`fɛktɪv/ adj
~ (in sth) having a defect or defects; imperfect or incomplete 有缺点的; 不完美的; 不完全的
a defective machine, method, theory 有缺陷的机器、 方法、 理论
defective in workmanship, character 技艺不高的、 性格上有缺陷的
Her hearing was found to be slightly defective. 她的听力稍弱.
a defective verb, ie one without the full range of endings that other verbs have, eg must 不完全变化动词（不似其他的有全部词尾变化的动词）.