usable Antonyms

not helpful out of order out of gear out of commission on the fritz on the blink unusable inoperable unproductive non-functional unworkable nonproductive nondisposable out of service out of whack gone kaput not in working order not functioning gone phut gone haywire conked out acting up not working non-working unserviceable unrepaired unconvertible dysfunctional nonfunctional inadequate inactive impractical impracticable idle flaky faulty down defective crocked bust broken inappropriate ineffective malfunctioning busted dud knackered broken-down kaput jiggered