Feeling frustrated, mortified, or bitter about a failure, injustice, or missed opportunity; used when disappointed or upset by a loss or mistake.
試合に負けて本当に悔しい。次は絶対勝ちたい。
I'm really frustrated about losing the match. I definitely want to win next time.
言い返せなかった自分が悔しくて、家で何度も練習した。
I was upset that I couldn't talk back, so I practiced many times at home.
悔しいけど、今回は彼の方がうまかった。
It's frustrating, but he was better this time.
悔しさをバネにしてもっと努力するつもりだ。
I plan to use this frustration as motivation to work harder.