WordWeb Online

1. Marked by up-to-dateness in dress and manners
   "a jaunty red hat"
   - dapper, dashing, natty, raffish, rakish, spiffy, snappy, spruce
    
2. Having a cheerful, lively, and self-confident air
   "walked with a jaunty step"; "a jaunty optimist"
   - chipper, debonair, debonaire

Derived forms: jauntiest, jauntier

See also: cheerful, fashionable, jauntily, jauntiness, stylish