IRREFUTABLE
irrefutable, incontrovertible, positive
(adjective) impossible to deny or disprove; “incontrovertible proof of the defendant’s innocence”; “proof positive”; “an irrefutable argument”
Source: WordNet® 3.1
Etymology
Adjective
irrefutable (comparative more irrefutable, superlative most irrefutable)
undeniable; unable to be disproved or refuted
Antonym: refutable
Source: Wiktionary
Ir`re*fut"a*ble, a. Etym: [L. irrefutabilis: cf. F. irréfutable. See
Refute.]
Definition: Incapable of being refuted or disproved; indisputable.
– Ir`re*fut"a*ble*ness, n.
– Ir`re*fut"a*bly, adv.
Source: Webster’s Unabridged Dictionary 1913 Edition