Overly convinced of one's own superiority and importance
The supercilious student couldn't help but to brag about the high score he received on his test.
It is better to be humble and succeed than to be supercilious and fail.
The supercilious lady next door doesn't even smile when we pass in the street.
The supercilious attitude of the opposing team was intimidating.
Even the woman's voice was unpleasant and supercilious, making her very unattractive to Jon. He liked people who were down to earth.