unusable
[adjective]
Synonyms: impracticable, impractical, nonfunctional, unfunctional, unserviceable, unworkable, useless

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Antonyms: usable

[TahlilGaran] English Synonym Dictionary ▲

un‧us‧a‧ble /ʌnˈjuːzəbəl/ adjective
[Word Family: noun: usage, use, disuse, misuse, reuse, usefulness ≠ uselessness, user; adjective: reusable, used ≠ unused, disused, useful ≠ useless, usable ≠ unusable; verb: use, misuse, reuse; adverb: usefully ≠ uselessly]
something that is unusable is in such a bad condition that you cannot use it

[TahlilGaran] Dictionary of Contemporary English ▲