malfunctioning

mal·func·tion

M0060500 (măl-fŭngk′shən)intr.v. mal·func·tioned, mal·func·tion·ing, mal·func·tions To fail to function properly.n. A failure to function properly.

Thesaurus

Adj.

1.

malfunctioning - not performing or able to perform its regular function; "a malfunctioning valve"nonfunctionalfunctioning - performing or able to perform its regular function; "a functioning flashlight"