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
From Longman Dictionary of Contemporary Englishunusableun‧us‧a‧ble /ʌnˈjuːzəbəl/ adjective something that is unusable is in such a bad condition that you cannot use itExamples from the Corpus
unusable• In its present condition it is unusable.• It also slowed my computer to a crawl and made it virtually unusable.• Officials said 60 of the 240 campsites in the Upper Pines campground are unusable.• Sadly, drugs used in a desperate attempt to save his life made most of his organs unusable.• But all of that military power is essentially unusable and irrelevant in the era ahead.• More than half of this plutonium is sitting in used fuel-rods from commercial reactors, unusable for anything until it is reprocessed. 