悔しい

In a sentence

• 試合に負けてとても悔しいです。

  I feel very frustrated because I lost the match.

  In this context, '悔しい' is used to express an individual's feeling of frustration or regret as a response to losing a competitive event.

• 努力したのに成功できず、悔しい思いをしています。

  I feel regretful because, despite my effort, I couldn't succeed.

  Here, '悔しい' conveys a sense of regret or disappointment stemming from the failure to achieve a desired outcome despite earnest attempts.

• 悔しいから次はもっと頑張ります。

  Because I feel frustrated, I will try even harder next time.

  In this sentence, '悔しい' describes a motivating disappointment, where the frustration serves as a catalyst for increased effort in future endeavors.