malfunctioning

not being in working order a malfunctioning computer cost us days of work Synonyms down, inoperative, kaput (also kaputt), inoperable, nonfunctional, nonfunctioning, nonoperatingRelated Words broken; off; deactivated, deadlocked, ineffective, ineffectual, nonproductive, unproductive, unusable, unworkable, uselessNear Antonyms effective, effectual, employable, performing, producing, productive, serving, usable (also useable), useful, viable, workableAntonyms functional, functioning, operable, operant, operating, operational, operative, running, working