deb·o·nair also deb·o·naire 
(dĕb′ə-nâr)
(dĕb′ə-nâr)adj.
1. Sophisticated; urbane.
2. Gracious and charming in a cheerful, carefree way.
[Middle English debonaire, gracious, kindly, from Old French, from de bon aire, of good lineage or disposition : de, of (from Latin dē; see DE-) + bon, bonne, good (from Latin bonus; see deu-2 in the Appendix of Indo-European roots) + aire, nest, family; see AERIE.]
deb′o·nairly adv.
deb′o·nairness n.