Etymology
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supercilious (adj.)

1520s, "lofty with pride, haughtily contemptuous," from Latin superciliosus "haughty, arrogant," from supercilium "haughty demeanor, pride," literally "eyebrow" (via notion of raising the eyebrow to express haughtiness), from super "above" (see super-) + second element akin to cilium "eyelid," related to celare "to cover, hide," from PIE root *kel- (1) "to cover, conceal, save." Related: Superciliously; superciliousness.

Since cilium is more recent than supercilium, the former can be interpreted as a back-formation to the latter .... If indeed derived from the root *kel- 'to hide', we must still assume that a noun *kilium 'eyelid' existed, since the eyelid can 'hide' the eye, whereas the eyebrow does not have such a function. Thus, supercilium may originally have meant 'what is above the cilium'. [Michiel de Vaan, "Etymological Dictionary of Latin and the other Italic Languages," Leiden, 2008]

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Definitions of supercilious

supercilious (adj.)
having or showing arrogant superiority to and disdain of those one views as unworthy; "a more swaggering mood than usual"- W.L.Shirer;
his mother eyed my clothes with a supercilious air
Synonyms: disdainful / haughty / imperious / lordly / overbearing / prideful / sniffy / swaggering
supercilious (adj.)
expressive of contempt;
curled his lip in a supercilious smile
Synonyms: sneering / snide
From wordnet.princeton.edu