The Collaborative International Dictionary of English v.0.48:
Uppish \Up"pish\, a. [From Up.] Proud; arrogant; assuming; putting on airs of superiority. [Colloq.] --T. Brown. -- Up"pish*ly, adv. [Colloq.] -- Up"pish*ness, n. [Colloq.] [1913 Webster]WordNet (r) 3.0 (2006):
uppishly adv 1: in a snobbish manner; "they snobbishly excluded their less wealthy friends from the party" [syn: snobbishly, snootily, uppishly]