IPA: /ˌsuːpəˈsɪliəs/
KK: /ˌsuːpərˈsɪliəs/
Having an attitude of superiority and looking down on others; showing disdain or arrogance.
His supercilious remarks made everyone feel uncomfortable at the meeting.
Supercilious → It is formed from "super-" (meaning above or over) and "cilium" (meaning eyelid or brow). The word describes someone who looks down on others, as if they are above them, often with a raised eyebrow.
Think of someone who looks 'above' ('super-') others with a raised 'brow' ('cilium') — that's why supercilious means behaving as if one is superior.