(adj) impossible to deny or disprove, Syn. irrefutable, positive, Example:incontrovertible proof of the defendant's innocence; proof positive; an irrefutable argument
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
a. Not controvertible; too clear or certain to admit of dispute; indisputable. Sir T. Browne. -- In*con`tro*ver"ti*ble*ness, n. -- In*con`tro*ver"ti*bly, adv. [ 1913 Webster ]