UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌsuːpərˈsɪliəs/

US:USA pronuncation: IPAUSA pronuncation: IPA/ˌsupɚˈsɪliəs/

US:USA pronunciation: respellingUSA pronunciation: respelling(so̅o̅′pər silē əs)

WordReference Random House Learner's Dictionary of American English © 2020
su•per•cil•i•ous /ˌsupɚˈsɪliəs/USA pronunciation   adj. 
  1. haughty and full of contempt for others:a supercilious raising of the eyebrows.

WordReference Random House Unabridged Dictionary of American English © 2020
su•per•cil•i•ous  (so̅o̅′pər silē əs),USA pronunciation adj. 
  1. haughtily disdainful or contemptuous, as a person or a facial expression.
su′per•cili•ous•ly, adv. 
su′per•cili•ous•ness, n. 
  • Latin superciliōsus. See supercilium, -ous
  • 1520–30
    arrogant, scornful.

Collins Concise English Dictionary © HarperCollins Publishers::
supercilious /ˌsuːpəˈsɪlɪəs/ adj
  1. displaying arrogant pride, scorn, or indifference
Etymology: 16th Century: from Latin superciliōsus, from supercilium eyebrow; see superciliary

ˌsuperˈciliously adv ˌsuperˈciliousness n
'supercilious' also found in these entries (note: many are not synonyms or translations):

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