The Collaborative International Dictionary of English v.0.48:

Valorous \Val"or*ous\, a. [Cf. F. valeureux, LL. valorosus.]
   Possessing or exhibiting valor; brave; courageous; valiant;
   intrepid. -- Val"or*ous*ly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

valorous
    adj 1: having or showing valor; "a valiant attempt to prevent
           the hijack"; "a valiant soldier" [syn: valiant,
           valorous]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "valorous":
   audacious, bold, bold-spirited, brave, chivalric, chivalrous,
   courageous, dauntless, doughty, fearless, gallant, greathearted,
   hardy, heroic, herolike, intrepid, ironhearted, knightlike,
   knightly, lionhearted, manful, manly, soldierlike, soldierly,
   stalwart, stout, stouthearted, undaunted, valiant