IPA: //ˌdɛbəˈnɛr.nəs//
KK: /ˌdɛbəˈnɛr/
The quality of being charming, confident, and stylish in appearance or manner.
His debonairness made him the center of attention at the party.
Debonairness is formed from "debonair" (from Old French *debonnaire*, meaning gentle or courteous) and the suffix "-ness" (meaning the state or quality of). The word refers to the quality of being charming, suave, and carefree.
Think of someone who is 'gentle' and 'courteous' ('debonair') — the '-ness' indicates the quality of being that way. This helps you remember that debonairness is the state of being charming and carefree.