The Collaborative International Dictionary of English v.0.48:

Plucky \Pluck"y\, a. [Compar. Pluckier; superl. Pluckiest.]
   Having pluck or courage; characterized by pluck; displaying
   pluck; courageous; spirited; as, a plucky race.
   [1913 Webster]

         If you're plucky, and not over subject to fright.
                                                  --Barham.
   [1913 Webster]