adj.后悔的，失望的，令人惋惜的，遗憾的

Mary is regretful about leaving the young children alone at home.
玛丽对留下年纪还小的孩子们独自在家感到很后悔。
Eric's decision made us regretful.
埃里克的决定令人感到遗憾。
Tom is regretful for what he has done.
汤姆对自己之所为感到后悔。
He felt deeply regretful for not spending more time with his family when he had the chance.
他深深地后悔没有在有机会的时候多花时间与家人在一起。
After turning down the job offer, she couldn't help but feel regretful about her decision.
拒绝了工作邀请后，她不禁对自己的决定感到后悔。
It's natural to feel regretful about past mistakes, but it's important to learn from them and move on.
对过去的错误感到后悔是很自然的，但重要的是要从中吸取教训并继续前进。
She was filled with regretful thoughts about the harsh words she had said to her friend in anger.
她对在愤怒中对朋友说的那些刻薄话充满了悔恨。
The regretful author wished he could rewrite the ending of his novel to give the characters a happier outcome.
那位后悔的作家希望自己能重写小说的结局，给角色一个更幸福的结局。
He looked back on his college years with a sense of regretful nostalgia, wishing he had made different choices.
他带着遗憾的怀旧之情回顾自己的大学时光，希望当时能做出不同的选择。
Feeling regretful about missed opportunities, she vowed to seize every chance that came her way in the future.
对于错失的机会感到后悔，她发誓将来要抓住每一个降临到她面前的机会。
The regretful traveler realized too late that he had forgotten his passport at home.
那位后悔的旅行者意识到自己把护照忘在家时已经太晚了。
She felt a twinge of regretful sadness as she sold her childhood home, knowing she could never go back.
当她卖掉童年的房子时，她感到了一丝遗憾的悲伤，因为她知道再也回不去了。
He expressed his regretful apologies for arriving late to the meeting, acknowledging the inconvenience it had caused.
他为开会迟到表达了歉意和后悔，承认这给大家带来了不便。