SPUNKY
game, gamy, gamey, gritty, mettlesome, spirited, spunky
(adjective) willing to face danger
feisty, plucky, spunky
(adjective) showing courage; “the champion is faced with a feisty challenger”
Source: WordNet® 3.1
Etymology
Adjective
spunky (comparative spunkier, superlative spunkiest)
Spirited or plucky.
(UK) Pertaining to or like spunk (semen).
(UK) Stained with semen.
Source: Wiktionary
Spunk"y, a. [Compar. Spunkier; superl. Spunkiest.]
Definition: Full of spunk; quick; spirited. [Colloq.]
Source: Webster’s Unabridged Dictionary 1913 Edition