Definition of unforgivable adjective from the Oxford Advanced American Dictionary

     

    unforgivable

     adjective
    adjective
    NAmE//ˌʌnfərˈɡɪvəbl//
     
     
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  1. 1if someone's behavior is unforgivable, it is so bad or unacceptable that you cannot forgive the person synonym inexcusable
  2. 2 It was an unforgivable thing to say. an unforgivable act of violence opposite forgivable
unforgivably
 
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NAmE//ˌʌnfərˈɡɪvəbli//
 
adverb He was unforgivably rude.
See the Oxford Advanced Learner's Dictionary entry: unforgivable