defective
adj
~ (in sth) having a defect or defects; imperfect or incomplete 有缺點的; 不完美的; 不完全的
a defective machine, method, theory 有缺陷的機器、 方法、 理論
defective in workmanship, character 技藝不高的、 性格上有缺陷的
Her hearing was found to be slightly defective. 她的聽力稍弱.
a defective verb, ie one without the full range of endings that other verbs have, eg must 不完全變化動詞(不似其他的有全部詞尾變化的動詞).