Definition of irrefutable adjective from the Oxford Advanced American Dictionary

 

irrefutable

 adjective
adjective
NAmE//ˌɪrɪˈfyut̮əbl//
 
, NAmE//ɪˈrɛfyət̮əbl//
 
(formal)
 
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that cannot be proved wrong and that must therefore be accepted irrefutable evidence
irrefutably
 
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NAmE//ˌɪrɪˈfyut̮əbli//
 
, NAmE//ɪˈrɛfyət̮əbli//
 
adverb
See the Oxford Advanced Learner's Dictionary entry: irrefutable