Definition of wistfulness noun from the Oxford Advanced Learner's Dictionary

 

wistfulness

 noun
noun
BrE BrE//ˈwɪstflnəs//
 
; NAmE NAmE//ˈwɪstflnəs//
 
[uncountable]
 
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a slightly sad feeling caused by thinking about something that you would like to have, especially something in the past that you can no longer have