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...現已不復存在的社會民主黨的領導人They bought all their equipment from a defunct brewery in Manhattan.他們那些設備都是從曼哈頓一家已經關閉的啤酒廠購買的。
英漢詞典釋義
adj.
(正式）已滅絕的；不再起作用的；不再使用的
The scheme for building an airport seems to be completely defunct now.建造新機場的計劃看來整個完蛋了。
英英詞典釋義
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 no longer in force or use; inactive;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"