Is it farther or further?
1590s, from Middle French gentil "stylish, fashionable, elegant; nice, graceful, pleasing," from Old French gentil "high-born, noble" (11c.); a reborrowing of the French word that had early come into English as gentle (q.v.), with French pronunciation and stress preserved to emphasize the distinction. Cf. also jaunty; gentile. OED 2nd ed. reports genteel "is now used, except by the ignorant, only in mockery" (a development it dates from the 1840s).