悔 means “regret, vexed”

くやしい · kuyashii

Also: repent

Kun'yomi (Japanese reading)
くいる, くやむ, くやしい
On'yomi (Chinese reading)
カイ

JLPT N1 · Taught in secondary school · 9 strokes

The story

The heart (忄) beside 毎, every: picture replaying a mistake every time you close your eyes. 悔しい is the sting of losing, 後悔 is regret, and 悔いのないように, so there is nothing to regret, is the classic pep talk before a big game.

Used in 悔しい (kuyashii, frustrating/galling), 後悔 (koukai, regret), and 悔い (kui, regret)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.