Debonair means confident, stylish and charming. A debonair manner, debonair and smiling, the debonair type.
It is used almost only of men and carries a whiff of the 1930s, which is either the charm of the word or its problem. The French phrase behind it means of good stock, so the ease was originally a claim about breeding.
1adjectivedebonairConfident, stylish and charming.
“The debonair young man in the white suit charmed everyone at the party.”
debonair is a quality.
Old French de bon aire means of good stock or good disposition.
Old French
de bon aire — of good stock; noble
Middle English
debonaire
English, today
debonair
Via Middle English debonaire from Old French de bon aire (“of good stock; noble”).
Etymology from Wiktionary, CC BY-SA