Source : Webster's Revised Unabridged Dictionary (1913)

Indisputable \In*dis"pu*ta*ble\ (?; 277), a. [Pref. in- not +
   disputable: cf. F. indisputable.]
   Not disputable; incontrovertible; too evident to admit of
   dispute.

   Syn: Incontestable; unquestionable; incontrovertible;
        undeniable; irrefragable; certain; positive; undoubted;
        sure; infallible. -- {In*dis"pu*ta*ble*ness}, n. --
        {In*dis"pu*ta*bly}, adv.