Source : Webster's Revised Unabridged Dictionary (1913)

Pluckiness \Pluck"i*ness\, n.
   The quality or state of being plucky.

Source : WordNet®

pluckiness
     n : the trait of showing courage and determination in spite of
         possible loss or injury [syn: {gutsiness}, {pluck}] [ant:
          {gutlessness}]