The Collaborative International Dictionary
Irrefutably
Irrefutable \Ir`re*fut"a*ble\ (?; 277), a. [L. irrefutabilis: cf. F. irr['e]futable. See Refute.] Incapable of being refuted or disproved; indisputable. -- Ir`re*fut"a*ble*ness, n. -- Ir`re*fut"a*bly, adv.
Wiktionary
irrefutably
adv. In an irrefutable manner; beyond the possibility of refutation.
Usage examples of "irrefutably".
And although the British shared his frustration at the totally inadequate Interpol inquiry, they didn't question its being held in camera or suggest there might have been some official connivance in the disappearance to disguise the fact that his father might not have done all or even part of what seemed to be irrefutably confirmed by what official documentation remained.