wistful /ˈwɪstfəl/ adjective Learner's definition of WISTFUL
[more wistful; most wistful]
: having or showing sad thoughts and feelings about something that you want to have or do and especially about something that made you happy in the past（对想拥有的事物，尤指曾带来愉快的事物）伤感的 -
She was wistful for a moment, then asked, “Do you remember the old playground?”她伤感了一会儿，接着问道：“你还记得那个旧运动场吗？”
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He had a wistful look on his face.他的脸上带有伤感的表情。
— wistfulness
noun [noncount]