Source : Webster's Revised Unabridged Dictionary (1913)

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

Source : WordNet®

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