PLUCKY
gutsy, plucky
(adjective) marked by courage and determination in the face of difficulties or danger; robust and uninhibited; “you have to admire her; it was a gutsy thing to do”; “the gutsy...intensity of her musical involvement”-Judith Crist; “a gutsy red wine”
feisty, plucky, spunky
(adjective) showing courage; “the champion is faced with a feisty challenger”
Source: WordNet® 3.1
Etymology
Adjective
plucky (comparative pluckier, superlative pluckiest)
(informal) Having or showing pluck, courage or spirit in trying circumstances.
Synonyms: brave, spunky, feisty
Source: Wiktionary
Pluck"y, a. [Compar. Pluckier; superl. Pluckiest.]
Definition: Having pluck or courage; characterized by pluck; displaying
pluck; courageous; spirited; as, a plucky race.
If you're plucky, and not over subject to fright. Barham.
Source: Webster’s Unabridged Dictionary 1913 Edition