Definition of unusable adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌʌnˈjuːzəbl//
; NAmE NAmE//ˌʌnˈjuːzəbl//
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in such a bad condition or of such low quality that it cannot be used opposite usableExtra examples The damage rendered the building unusable. The plutonium is unusable for anything until it is reprocessed. The water in the wells has become unusable.
See the Oxford Advanced American Dictionary entry: unusable