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to feel ashamed
恩師の期待に応えられず愧じる思いでいっぱいだ。
I am filled with shame for not being able to live up to my mentor's expectations.
同僚の成果と比べて自分の努力不足を愧じた。
Compared with my colleague's results, I felt ashamed of my lack of effort.
公の場での失言を深く愧じて謝罪した。
I deeply felt ashamed of my gaffe in public and apologized.