Both Uses

supercilious
in
Pride and Prejudice
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For, though elated by his rank, it did not render him supercilious; on the contrary, he was all attention to everybody.†
p. 19.5 *

supercilious = arrogant
By Jane, this attention was received with the greatest pleasure, but Elizabeth still saw superciliousness in their treatment of everybody, hardly excepting even her sister, and could not like them; though their kindness to Jane, such as it was, had a value as arising in all probability from the influence of their brother's admiration.†
p. 22.3

Definitions:

(1) (supercilious)
arrogant (acting as if better, more important, and superior in ideas than others)
(2) (meaning too rare to warrant focus)