Synonyms for Inoperative:

adj.

ineffectual (adjective)
broken, unworkable, defective, void, faulty.

n.

auxiliary, clever, automatic, automatically, clockwork, clean, built, analog, cordless. idle, inactive, action, inert. ineffectual (noun)
faulty, defective, unworkable, broken, weak, void.
inoperative (noun)
defunct, down, dead.

Other synonyms:

inactive, inert, broken. idle. down. Other relevant words:
faulty, inactive, idle, void, defective, broken, unworkable, inert.

Usage examples for inoperative

  1. Certain Gunther areas of your brain are inoperative – The Galaxy Primes by Edward Elmer Smith