- 1true or certain; that cannot be denied synonym indisputable
- 2 He had undeniable charm. It is an undeniable fact that crime is increasing. opposite deniable Word Familydeny verbdenial nounundeniable adjectiveundeniably adverb
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NAmE//ˌʌndɪˈnaɪəbli//adverb undeniably impressive He is, undeniably, an excellent player.