regret
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後で後悔しないように、今全力を尽くしたい。
I want to do my best now so that I do not regret it later.
彼は軽率な発言を後悔していた。
He regretted his careless remark.
後悔よりも反省を次に生かすことが大切だ。
It is more important to make use of reflection for the next time than to dwell on regret.