The Collaborative International Dictionary
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.
Wiktionary
adv. In a supercilious manner.
WordNet
adv. with a sneer; in an uncomplimentary sneering manner; "`I don't believe in these customs,' he said sneeringly" [syn: sneeringly, snidely]
Usage examples of "superciliously".
Each time Kuri approached her, she lumbered off to a safe distance, then stopped and stared superciliously.
Fools, especially snotty twits like the man who had superciliously informed him that slavery could not possibly antedate genetic science, he did not suffer gladly.