Charming, often in a childlike or naive way.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "winsome" in a sentence
"The one, Juliana, the only daughter of a retired sea-captain, he described as a winsome lassie."
"Then her arms dropped, and she looked straight into camera, her mobile face composed in an expression winsome and grave, and so light it might change with breeze."
"She had about her that charm of manner which can only be described as winsome womanliness."