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1·Mary Ann shot him a rueful look.

玛丽·安悔恨地瞥了他一眼。《柯林斯英汉双解大词典》

2·He shook his head and gave me a rueful smile.

他摇了摇头，对我苦笑了一下。《柯林斯英汉双解大词典》

3·Ellen gave me a rueful smile.

埃伦对我凄然一笑。

4·Reckless youth makes rueful age.

鲁莽的青春造成可怜的日子。

5·She managed a rueful little smile.

她勉强露出颇带惆怅的一丝笑容。

6·He was rueful for joining the army.

他感到后悔去参军。

7·The boy's first outcry was a rueful laugh.

那男孩的第一声惨叫是一声惨笑。

8·His most rueful film is Now About These Women.

他最令人悲伤的电影是《这些女人们》。

9·He is by nature an optimistic man; his smile is rueful.

他天生就是个乐观的人，他的微笑让人心痛。

10·She could not help laughing at his rueful countenance.

她看他愁眉苦脸，忍不住笑起来。

悔恨的

1·The message has an emotional tone that is authentically sad/fearful/angry and at the same time, is by marked by a rueful calm, by gentleness, and by courage.

这里边有一种真正悲哀/恐惧/愤怒的情绪化腔调，与此同时又带有悔恨的平静、温顺和勇气。