What does "supercilious" mean?

Supercilious: 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.

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