WordNet (r) 3.0 (2006):

uppity
    adj 1: presumptuously arrogant; "had a witty but overweening
           manner"; "no idea how overweening he would be"-
           S.V.Benet; "getting a little uppity and needed to be
           slapped down"- NY Times [syn: overweening, uppity]

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "uppity":
   arrogant, audacious, big, brash, bumptious, cold, condescending,
   contumelious, cool, disdainful, domineering, familiar, forward,
   haughty, high-faluting, high-flown, high-headed, high-nosed,
   hoity-toity, hubristic, insolent, insulting, lofty, obtrusive,
   overbearing, overpresumptuous, overweening, patronizing, presuming,
   presumptuous, procacious, proud, purse-proud, pushful, pushing,
   pushy, self-asserting, self-assertive, stuck-up, superior,
   toplofty, uppish, upstage