if someone's behavior is unforgivable, it is so bad or unacceptable that you cannot forgive the person synonym inexcusable It was an unforgivable thing to say. an unforgivable act of violence opposite forgivable
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NAmE//ˌʌnfərˈɡɪvəbli//
adverb He was unforgivably rude.See unforgivable in the Oxford Advanced Learner's DictionaryCheck pronunciation: unforgivable