incontrovertibly

from WordNet (r) 3.0 (2006)

incontrovertibly
    adv 1: in an obvious and provable manner; "his documentary
           sources are demonstrably wrong" [syn: {demonstrably},
           {provably}, {incontrovertibly}]

from The Collaborative International Dictionary of English v.0.48

Incontrovertible \In*con`tro*ver"ti*ble\, 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]