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



BrE BrE//ˌɪnɪkˈskjuːzəbl//
; NAmE NAmE//ˌɪnɪkˈskjuːzəbl//
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too bad to accept or forgive synonym unjustifiable inexcusable rudeness a quite inexcusable level of interference opposite excusable Word Originlate Middle English: from Latin inexcusabilis, from in- ‘not’ + excusabilis ‘able to be excused’ (from excusare ‘to free from blame’, from ex- ‘out’ + causa ‘accusation, cause’).
See the Oxford Advanced American Dictionary entry: inexcusable