Winsome [WIN-suhm]
(adj.)
- Attractive or appealing in appearance or character.
- Sweetly or innocently charming; engaging.

From Middle English “winsum” from Old English “wynsum” from “wynn” (joy) related to Old High German "wunna” (joy) from Latin “venus” (desire)

Used in a sentence:
“I knew she was the one for me the moment I saw her winsome smile.”