usable Antonyms

not helpful out of gear out of commission on the fritz on the blink unusable inoperable unproductive non-functional unworkable nonproductive nonoperational nondisposable out of order 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 inconvertible ineffective malfunctioning busted dud knackered broken-down