The word 'supercilious' has a vivid literal origin in Latin. It derives from 'supercilium', which meant "eyebrow" (from 'super-' "above" + 'cilium' "eyelid"). The raising of an eyebrow was a classic gesture of haughty disdain or arrogant scrutiny. Over time, the Latin adjective 'superciliosus' evolved to describe someone characterized by such an expression or attitude. The modern English meaning retains this core idea, abstracting the physical gesture into the general quality of arrogant superiority.

Structure: super (above) + cili (eyelid) + ous (adjective suffix) super: Latin origin, meaning "above, over". Acts as a prefix indicating position or degree. cili: From Latin 'cilium', meaning "eyelid". Acts as the core root. ous: Latin-derived suffix forming adjectives, meaning "full of, having the qualities of".