[syn: supercilious, sneering, snide]
The Collaborative International Dictionary of English v.0.48:
Supercilious \Su`per*cil"i*ous\, a. [L. superciliosus, fr.
   supercilium an eyebrow, pride; super over, + cilium an
   eyelid; probably akin to celare to conceal. Cf. Conceal.]
   Lofty with pride; haughty; dictatorial; overbearing;
   arrogant; as, a supercilious officer; asupercilious air;
   supercilious behavior. -- Su`per*cil"i*ous*ly, adv. --
   Su`per*cil"i*ous*ness, n.
   [1913 Webster]
WordNet (r) 3.0 (2006):
supercilious
    adj 1: having or showing arrogant superiority to and disdain of
           those one views as unworthy; "some economists are
           disdainful of their colleagues in other social
           disciplines"; "haughty aristocrats"; "his lordly manners
           were offensive"; "walked with a prideful swagger"; "very
           sniffy about breaches of etiquette"; "his mother eyed my
           clothes with a supercilious air"; "a more swaggering mood
           than usual"- W.L.Shirer [syn: disdainful, haughty,
           imperious, lordly, overbearing, prideful,
           sniffy, supercilious, swaggering]
    2: expressive of contempt; "curled his lip in a supercilious
       smile"; "spoke in a sneering jeering manner"; "makes many a
       sharp comparison but never a mean or snide one" [syn:
       supercilious, sneering, snide]
Moby Thesaurus II by Grady Ward, 1.0:
40 Moby Thesaurus words for "supercilious":
   arrogant, cavalier, clannish, cliquish, condescending,
   contemptuous, contumelious, disdainful, dismissive, exclusive,
   haughty, high and mighty, high-and-mighty, highfalutin,
   hoity-toity, insolent, la-di-da, lofty, lordly, overbearing,
   patronizing, pompous, pretentious, scornful, sneering, sniffy,
   snippy, snobbish, snobby, snooty, snotty, snuffy, stuck-up, stuffy,
   superior, toploftical, toplofty, uppish, uppity, withering