rueful

adj.

后悔的，悔恨的；悲伤的；可怜的；

1. She managed a rueful little smile.
   她勉强露出颇带惆怅的一丝笑容。
2. He was rueful for joining the army.
   他感到后悔去参军。

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Keeping Beckett Company: At BAM and beyond, His Plays Propel the Willing on a Rueful Search for Meaning