JMdict: 1200420

悔しさ 【くやしさ】

  1. [n] chagrin; bitterness; frustration; vexation; mortification; regret
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
Repent, Regret カイ く.いる, く.やむ, くや.しい

Words often seen with this one: (experimental feature)

この (16), その (11)