debonair (adj.)

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); aire here is perhaps from Latin ager "place, field" (from PIE root *agro- "field") 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).

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