悔くやしさ

noun

frustration; regret; chagrin

The noun form of 悔しい, expressing a mix of frustration, regret, and bitterness, often over one's own failure or an unfair situation.

• 試し合あいに負まけて悔くやしさでいっぱいだ。

  I'm filled with frustration after losing the match.

• 彼かれは悔くやしさをこらえて、次つぎの挑ちょう戦せんに備そなえた。

  He swallowed his regret and prepared for the next challenge.