悔しい

くやしい

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

i-adjective

N3 freq #27

Example sentences

決勝戦（けっしょうせん）で負（ま）けるほど悔（くや）しいものはない。

Nothing is more disappointing than to lose in the finals.