undisputable

from WordNet (r) 3.0 (2006)

undisputable
    adj 1: not open to question; obviously true; "undeniable guilt";
           "indisputable evidence of a witness" [syn:
           {incontestable}, {indisputable}, {undisputable}]

from The Collaborative International Dictionary of English v.0.48

Undisputable \Un*dis"pu*ta*ble\, a.
   Indisputable. --Addison. -- {Un*dis"pu*ta*ble*ness}, n.
   [1913 Webster]

[email protected]