Synonyms of malfunctioning

Verb

1. malfunction, misfunction, fail, go bad, give way, die, give out, conk out, go, break, break down

usage: fail to function or function improperly; "the coffee maker malfunctioned"

Adjective

1. malfunctioning (vs. functioning), nonfunctional, amiss(predicate), awry(predicate), haywire, wrong(predicate), bad, defective, out of whack, run-down

usage: not performing or able to perform its regular function; "a malfunctioning valve"