Debonair: charming and carefree; suave; gracious; urbane; nonchalant; having sophisticated charm

We all admired the dinner guest with his laid-back, debonair attitude.  

Debonair comes from the old French phrase de bon aire.  De bon aire in old French means “of a good race”.  Originally the term was applied to hawks in the thoroughbred sense.  Aire may further derive from the Latin word for field, ager.  In this sense, de bon aire would refer to a place of origin.  

Synonyms of debonair are affable, dashing, elegant, refined, or suave. 

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