defunct

(now rare) Deceased, dead.

No longer in use or active, nor expected to be again.

(business) No longer in business or service, nor expected to be again.

(computing) Specifically, of a process: having terminated but not having been reaped (by its parent or an inheritor), and thus still occupying a process slot. See also zombie, zombie process.

(linguistics) (of a language) No longer spoken.