Rueful Virgin可怜的处女
rueful impenitent悔恨的
a rueful expression懊悔的表情
Reckless youth makes rueful age虚度青春;悔恨无已
Knight of the Rueful Countenance愁容骑士
ADJ（形容词） If someone is rueful, they feel or express regret or sorrow in a quiet and gentle way. 悲伤的; 悔恨的 [文学性][usu ADV with v]
He shook his head and gave me a rueful smile.
他摇了摇头，对我苦笑了一下。
ADV（副词） ruefully
He grinned at her ruefully.
他对她咧嘴一笑，表示遗憾。