defective
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).
Of course he is. He's very successful. He's made lots of records. They broadcast a programme of his music last month on the radio. Why don't you come on Saturday? I think you'd enjoy it.