strong-willed; determined; competitive
Describes a person, especially a woman or child, who is spirited, unyielding, and hates to lose. Often carries a positive nuance of lively determination, but can imply stubbornness depending on context.
She is strong-willed and puts her all into everything she does.
That child is so competitive that he cries when he loses a game.
Standard kanji spelling with high frequency ranking.
Variant spelling without okurigana; less common but still encountered.
Compound of 勝ち (kachi, 'winning') + 気 (ki, 'spirit, temperament'). The combination yields the meaning of a competitive, determined disposition.