If something is defunct, it no longer exists or has stopped functioning or operating.
例句
...the leader of the now defunct Social Democratic Party...现已不复存在的社会民主党的领导人They bought all their equipment from a defunct brewery in Manhattan.他们那些设备都是从曼哈顿一家已经关闭的啤酒厂购买的。
英汉词典释义
adj.
(正式)已灭绝的;不再起作用的;不再使用的
The scheme for building an airport seems to be completely defunct now.建造新机场的计划看来整个完蛋了。
英英词典释义
Adjective
1. no longer in force or use; inactive;
"a defunct (or dead) law""a defunct organization"
2. having ceased to exist or live;
"the will of a defunct aunt""a defunct Indian tribe"