busy
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年度末は業務が煩忙を極める。
At the end of the fiscal year, work becomes extremely busy.
煩忙のため、返信が遅れて申し訳ありません。
I am sorry for the delayed reply due to being extremely busy.
煩忙期には体調管理が特に重要だ。
During busy periods, managing your health is especially important.