Definition of irrefutable adjective from the Oxford Advanced Learner's Dictionary

 

irrefutable

 adjective
adjective
BrE BrE//ˌɪrɪˈfjuːtəbl//
 
; NAmE NAmE//ˌɪrɪˈfjuːtəbl//
 
; BrE BrE//ɪˈrefjətəbl//
 
; NAmE NAmE//ɪˈrefjətəbl//
 
(formal)
 
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that cannot be proved wrong and that must therefore be accepted irrefutable evidence Word Origin early 17th cent.: from late Latin irrefutabilis, from in- ‘not’ + refutabilis (from refutare ‘repel, rebut’).Extra examples The evidence given is not irrefutable. There was no answer to her irrefutable logic. We must face the irrefutable fact that there is no money left for such projects.
See the Oxford Advanced American Dictionary entry: irrefutable