Pluckiest

from 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]
    

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