悔しい

くやしい · also くやしーい

frustrated (over a failure, humiliation or injustice); annoyed; chagrined; (bitterly) disappointed

JLPT N2 common word Also written 口惜しい、悔やしい

Meaning

adj-i
frustrated (over a failure, humiliation or injustice); annoyed; chagrined; (bitterly) disappointed; bitter; vexed; frustrating; annoying; regrettable

Example sentences

今後悔していることは、時間の無駄をしたことのほうです。

What I regret now is, rather, that I wasted time.
監督はチームをトーナメント優勝に今一歩という所までもっていったのに悔しいことだった。

It was annoying, as the manager took his team to a near-miss in the tournament.
彼は事業の失敗を悔しがった。

He was mortified at his failure in business.