1. 
[syn: fresh, impertinent, impudent, overbold, smart, saucy, sassy, wise]
WordNet (r) 3.0 (2006):
sassy
    adj 1: improperly forward or bold; "don't be fresh with me";
           "impertinent of a child to lecture a grownup"; "an
           impudent boy given to insulting strangers"; "Don't get
           wise with me!" [syn: fresh, impertinent, impudent,
           overbold, smart, saucy, sassy, wise]
Moby Thesaurus II by Grady Ward, 1.0:
39 Moby Thesaurus words for "sassy":
   audacious, bandbox, biggety, bluff, bold, brash, brazen, cheeky,
   chutzpadik, cocky, contemptuous, crusty, derisive, disrespectful,
   doggy, facy, flip, flippant, forward, fresh, gally, gratuitous,
   impertinent, impudent, malapert, natty, nervy, pert, rude, saucy,
   smart, smart-alecky, smart-ass, spiffy, spruce, unabashed,
   uncalled-for, well-groomed, wise-ass