adj.悲伤的，懊悔的，沮丧的

She wore a rueful expression as she recounted her mistake.
她在讲述自己的错误时带着懊悔的表情。
He gave a rueful smile, acknowledging his failure.
他苦涩地笑了笑，承认了自己的失败。
With a rueful sigh, she realized she had forgotten the keys again.
她懊恼地叹了口气，发现自己又忘记带钥匙了。
His rueful look showed he regretted his hasty words.
他懊悔的神情显示出他对冲动说出的话感到后悔。
The mother exchanged rueful glances after their toddler's tantrum.
在孩子发脾气后，母亲们交换了一个无奈的眼神。
I should have studied more," he said with a rueful shake of his head.
“我应该更努力学习的，”他摇头道，满是懊悔。
She gave a rueful chuckle at the irony of the situation.
面对这种讽刺的情况，她苦笑了一声。
The old friend met with a rueful nostalgia for their lost youth.
这位老朋友对逝去的青春充满了惋惜的怀旧之情。
He looked ruefully at the empty wine bottle, wishing he had saved some.
他遗憾地看着空酒瓶，希望自己留了一些。
After spilling coffee on her new dress, she wore a rueful grimace.
把咖啡洒在新裙子上后，她露出懊恼的苦笑。