/ ˌɪrɪˈfjuːtəbl; NAmE ; ɪˈrefjətəbl/ adjective
( formal ) that cannot be proved wrong and that must therefore be accepted :
irrefutable evidence
► ir·re·fut·ably / -əbli; NAmE / adverb
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WORD ORIGIN
early 17th cent.: from late Latin irrefutabilis , from in- not + refutabilis (from refutare repel, rebut).