The Collaborative International Dictionary of English v.0.48:

Jaunty \Jaun"ty\, a. [Compar. Jauntier; superl. Jauntiest.]
   [Formerly spelt janty, fr. F. gentil. See Gentle, and cf.
   Genty.]
   Airy; showy; finical; hence, characterized by an affected or
   fantastical manner.
   [1913 Webster]

WordNet (r) 3.0 (2006):

jaunty
    adj 1: marked by up-to-dateness in dress and manners; "a dapper
           young man"; "a jaunty red hat" [syn: dapper, dashing,
           jaunty, natty, raffish, rakish, spiffy,
           snappy, spruce]
    2: having a cheerful, lively, and self-confident air; "looking
       chipper, like a man...diverted by his own wit"- Frances G.
       Patton; "life that is gay, brisk, and debonair"-
       H.M.Reynolds; "walked with a jaunty step"; "a jaunty
       optimist" [syn: chipper, debonair, debonaire, jaunty]

Moby Thesaurus II by Grady Ward, 1.0:

87 Moby Thesaurus words for "jaunty":
   airy, blithe, brave, bravura, braw, breezy, brisk, buoyant,
   carefree, cheerful, chic, chichi, classy, clothes-conscious,
   colorful, corky, cosmopolitan, dapper, daring, dashing, debonair,
   dressed to advantage, dressed to kill, dressy, elegant,
   exhibitionistic, exquisite, flamboyant, flash, flashing, flashy,
   flaunting, free and easy, frilly, frisky, frothy, gallant, gay,
   genteel, glittering, happy, high-spirited, jazzy, jolly, jovial,
   jubilant, light, lighthearted, lightsome, lively, merry, natty,
   neat, nifty, nobby, perky, posh, rakish, recherche, resilient,
   ritzy, sharp, showy, sleek, smart, smug, snazzy, soigne, soignee,
   sophisticated, spiffy, spirited, splashy, splurgy, sporty,
   sprightly, spruce, style-conscious, stylish, swank, swanky, swell,
   tricksy, trig, trim, well-dressed, well-groomed