ir ‧ re ‧ fu ‧ ta ‧ ble /ˌɪrɪˈfjuːtəb ə l◂ $ ɪˈrefjətəb ə l, ˌɪrɪˈfjuː-/ BrE AmE adjective
an irrefutable statement, argument etc cannot be proved to be wrong, and must be accepted ⇨ refute
irrefutable evidence/proof/facts
irrefutable proof of his innocence
—irrefutably adverb