adjective
having or showing a feeling of vague or regretful longing
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As she gazed out the window at the falling leaves, a wistful expression crossed her face.
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Whenever he listened to that old song, he couldn't help but feel wistful about the good old days.
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Seeing her ex with someone new made her feel all wistful and nostalgic.
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The abandoned house stood in the field, its empty windows looking wistful as if longing for the laughter of children.