Or you could ignore the gender stereotype attached with it and use the equally accepted definition per its meaning only without including societal connotations, making the definition of debonair as follows:
Debonair
deb-uh-nair
Adjective
- courteous, gracious, and having a sophisticated charm
- jaunty; carefree; sprightly
Source: http://dictionary.reference.com/browse/debonair
Or if you'd like another site that also excludes the dated specification on gender view the following:
Deb-o-nair (also deb-o-naire)
Adjective
- Suave; urbane
- Affable; genial
- Carefree and gay; jaunty
Source: http://www.thefreedictionary.com/debonair
It's important to note that the phrase itself is pulled from roots specifically referring to behavior, attitude, and lineage. The roots of the word are not specifically related to gender in any form and never have been, it was simply colloquially used to refer to male subjects in the fashion that gorgeous and beautiful are words that we more often hear associated with females as opposed to males. Just as gorgeous and beautiful are not actually only female applicable, debonair isn't specifically limited to male applicable.
Edit: So the person deleted or a mod deleted their post. It was in regards to debonair being a word that was specifically meant for males and by definition couldn't apply to females. Posting this edit so people can have context in case they view the thread and see my comment.