Definition of undeniable adjective from the Oxford Advanced American Dictionary

      

    undeniable

     adjective
    adjective
    NAmE//ˌʌndɪˈnaɪəbl//
     
     
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  1. 1true or certain; that cannot be denied synonym indisputable
  2. 2 He had undeniable charm. It is an undeniable fact that crime is increasing. opposite deniable
  3. Word Familydeny verbdenial nounundeniable adjectiveundeniably adverb
NAmE//ˌʌndɪˈnaɪəbli//
 
adverb undeniably impressive He is, undeniably, an excellent player.
See the Oxford Advanced Learner's Dictionary entry: undeniable