The Collaborative International Dictionary of English v.0.48:
Fearless \Fear"less\, a. Free from fear. Syn: Bold; daring; courageous; intrepid; valorous; valiant; brave; undaunted; dauntless; heroic. -- Fear"less*ly, adv. -- Fear"less*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
fearlessness n 1: feeling no fear [syn: fearlessness, bravery] [ant: fear, fearfulness, fright] 2: the trait of feeling no fear [ant: fearfulness]