adjective
winsome
WIN-sum/ˈwɪnsəm/
Attractive in a sweet or innocent way.
The young man's winsome smile accompanies his modest offer of a daisy.

Etymology
The pieces describe something that gives delight. The older broad meaning “pleasant or agreeable” developed into attractiveness in appearance, connecting delight with the sweet charm expressed today.
In context
Her face was strangely beautiful and winsome, and when her lips parted in a smile, a dimple of the most distracting charm twinkled upon her left cheek.
More examples
- The puppy tilts its head with a winsome expression.
- Her winsome charm puts new classmates at ease.
- He plays a winsome young dreamer in the comedy.
Forms
winsome · winsomer · winsomest
winsomely adverb — In a sweetly charming or innocent way.
winsomeness noun — The quality of being sweetly charming.