Source : Webster's Revised Unabridged Dictionary (1913)

Dauntless \Daunt"less\, a.
   Incapable of being daunted; undaunted; bold; fearless;
   intrepid.

         Dauntless he rose, and to the fight returned. --Dryden.
   -- {Daunt"less*ly}, adv. -- {Daunt"less*ness}, n.

Source : WordNet®

dauntlessness
     n : resolute courageousness [syn: {intrepidity}]