debonair (adj.) Look up debonair at Dictionary.com
c. 1200, "mild, gentle, kind courteous," from Old French debonaire, from de bon' aire "of good race," originally used of hawks, hence, "thoroughbred" (opposite of French demalaire), perhaps from Latin ager "place, field" (see acre) on notion of "place of origin." Used in Middle English to mean "docile, courteous," it became obsolete and was revived with an altered sense of "pleasant, affable" (1680s).