1529, from L. superciliosus "haughty, arrogant," from supercilium "haughty demeanor, pride," lit. "eyebrow" (via notion of raising the eyebrow to express haughtiness), from super "above" (see
super-) + cilium "eyelid," related to celare "to cover, hide," from PIE base *kel- "to conceal" (see
cell).