wistful

showing pensive sadness

Longing; wishful; desirous.

from Old English wisan, to know, with a sense of longing

“Looking like some burnished eagle Hovering o'er a fluttered bird; Not unseen of silver Naiad, And of wistful Dryad heard!”

— George Meredith, Complete Project Gutenberg Works of George Meredith

“The range of styles on Never for Ever is much more diverse, veering from the straightforward rocker "Violin" to the wistful waltz of hit single "Army Dreamers".”