Definition of wistful adjective from the Oxford Advanced Learner's Dictionary

 

wistful

 adjective
adjective
BrE BrE//ˈwɪstfl//
 
; NAmE NAmE//ˈwɪstfl//
 
 
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thinking sadly about something that you would like to have, especially something in the past that you can no longer have a wistful smile There was something rather wistful about the sad little tune. Word Origin early 17th cent.: apparently from obsolete wistly ‘intently’, influenced by wishful.
See the Oxford Advanced American Dictionary entry: wistful