Not capable of being carried out in practice
Lacking in utility or serviceability; not useful.
Having no use; unserviceable; worthless
Find another word for unusable. In this page you can discover 14 synonyms, antonyms, idiomatic expressions, and related words for unusable, like: impracticable, used, impractical, unnegotiable, unserviceable, unworkable, useless, ineffectual, inutile, useless and worthless.