The Collaborative International Dictionary of English v.0.48:

Unafraid \Unafraid\
   See afraid.

WordNet (r) 3.0 (2006):

unafraid
    adj 1: oblivious of dangers or perils or calmly resolute in
           facing them [syn: unafraid(p), fearless] [ant:
           afraid(p)]
    2: free from fear or doubt; easy in mind; "he was secure that
       nothing will be held against him" [syn: secure, unafraid,
       untroubled] [ant: insecure]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "unafraid":
   arrogant, assured, audacious, aweless, bold, cocksure, composed,
   confident, convinced, cool, courageous, dauntless, decided,
   determined, dreadless, fearless, hubristic, imperturbable,
   intrepid, overconfident, oversure, overweening, persuaded, poised,
   pompous, positive, proud, reassured, secure, self-assured,
   self-confident, self-important, self-reliant, sure, unapprehensive,
   unbashful, undaunted, undiffident, undoubting, unfaltering,
   unfearful, unfearing, unfrightened, unhesitating, unscared, unshy,
   unterrified, untimid, untimorous, unwavering, valiant, valorous