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English definition of “undeniable”

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adjective [not gradable]  /ˌʌn·dɪˈnɑɪ·ə·bəl/ us  
so obviously true that it cannot be doubted: It is an undeniable fact that ice is cold.
adverb [not gradable]  /ˌʌn·dɪˈnɑɪ·ə·bli/ us  
She is undeniably brilliant.
(Definition of undeniable from the Cambridge Academic Content Dictionary © Cambridge University Press)
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