adj.死的；不能使用的；非现存的；失效的
n.死者
A family name becomes defunct when the only heir dies without any son. 当唯一的继承人死去了之后没儿子，那这个姓就要绝迹了。
It is a defunct political organization. 这是一个解散了的政治组织。
用作名词 (n.)Most of the time of the defunct had been passed in helping himself. 死者生前大部分时间都是用来造福自己。
机能丧失,机能丧失机能丧失
