Definition of incontrovertibly adverb from the Oxford Advanced Learner's Dictionary

 

incontrovertibly

 adverb
adverb
BrE BrE//ˌɪnkɒntrəˈvɜːtəbli//
 
; NAmE NAmE//ˌɪnkɑːntrəˈvɜːrtəbli//
 
(formal)
 
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in a way that cannot be disagreed with or denied synonym incontestably, indisputably Her book shows incontrovertibly that he was innocent.