regrettable
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あと一歩で負けてしまい、とても悔しい。
We lost by just one step, and it is very frustrating.
悔しい気持ちをばねにして練習を続けた。
I used my frustration as motivation and kept practicing.
努力が報われないと悔しいものだ。
It is frustrating when your efforts are not rewarded.