1.  spunky(s = adj.all) feisty, plucky - showing courage; "the champion is faced with a feisty challenger"
Derived form noun spunk₂

2.  spunky(s = adj.all) game, gamey, gamy, gritty, mettlesome, spirited - willing to face danger;
Derived form noun spunk₂

   Full of spunk; quick; spirited. [1913 Webster]

spunky, adj. (spunkier, spunkiest) colloq. brave, spirited.

Derivative:
spunkily adv.