Antonyms of adj unusable
1 sense of unusable
Sense 1
unserviceable, unusable, unuseable -- (not capable of being used)
INDIRECT (VIA useless) -> useful, utile -- (being of use or service; "the girl felt motherly and useful"; "a useful job"; "a useful member of society")
Similarity of adj unusable
1 sense of unusable
Sense 1
unserviceable, unusable, unuseable -- (not capable of being used)
=> useless (vs. useful) -- (having no beneficial use or incapable of functioning usefully; "a kitchen full of useless gadgets"; "she is useless in an emergency")