Source : Webster's Revised Unabridged Dictionary (1913)

Fearless \Fear"less\, a.
   Free from fear.

   Syn: Bold; courageous; intrepid; valorous; valiant; brave;
        undaunted; dauntless; heroic. -- {Fear"less*ly}, adv. --
        {Fear"less*ness}, n.

Source : WordNet®

fearlessness
     n 1: feeling no fear [syn: {bravery}] [ant: {fear}]
     2: the trait of feeling no fear [ant: {fearfulness}]