くやしい
vexing, frustrating
The heart goes over the losing goal every time you shut your eyes, and the match was two days ago. The same 悔 as the regret in 後悔, and coo くや, she しい cannot let it go: くやしい.
後悔 こうかい is regret at something you did. 悔しい is the sting of having lost or been beaten.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.