rueful
词根词缀：
armful n. 一抱
arm 手臂 + ful 充满时的量 → 一抱
boatful n. 一船
boat 小船 + ful 充满时的量 → 一船
dishful n. 一碟
dish 盘 + ful 充满时的量 → 一碟
handful n. 一把
hand 手 + ful 充满时的量 → 一把
mouthful n. 一口
mouth 口 + ful 充满时的量 → 一口
spoonful n. 一勺
spoon 匙 + ful 充满时的量 → 一勺
数据来源：新东方英语词汇速记大全
相关例句：
Consequently, it is safe to say that the Chinese modern writers had undergone three main psychic metastasis phases: being mixed feelings, rueful and ruptured.
可以说，中国现代作家的对日认识，是爱恨交织、惋惜、再到决裂的三部曲。
'Our marriage was a mistake,' she said, looking rueful.
“我们的婚姻是个错误，”她说着，看起来懊悔不已。
One rival Wall Street executive describes Goldman ( with rueful admiration) as a bunch of clever thugs.
一位其竞争对手的高管（带着悔恨的羡慕之情），将高盛描述成是一帮聪明的暴徒。
The play is a rueful, wry observation about the way we are all subject to the ravages of time
该剧凄然而讽刺地描述了我们大家是如何被岁月所摧残的。
He thought of her with a rueful smile.
他苦笑着回想她。
She managed a rueful little smile.
她勉强露出颇带惆怅的一丝笑容。