The Collaborative International Dictionary of English v.0.48:

dauntless \daunt"less\, a.
   Incapable of being daunted; undaunted; bold; fearless;
   intrepid.
   [1913 Webster]

         Dauntless he rose, and to the fight returned. --Dryden.
   -- Daunt"less*ly, adv. -- Daunt"less*ness, n.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

dauntlessness \dauntlessness\ n.
   resolute courageousness.

   Syn: intrepidity.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

dauntlessness
    n 1: resolute courageousness [syn: dauntlessness,
         intrepidity]