What is a synononym for the word supercilious?

Here are some synonyms for "supercilious," depending on the specific nuance you want to convey:

General arrogance:

* Arrogant

* Haughty

* Condescending

* Patronizing

* Snobbish

* Smug

* Pompous

* Imperious

More subtle or veiled arrogance:

* Disdainful

* Scornful

* Aloof

* Superficial

* High-handed

Formal synonyms:

* Overbearing

* Pretentious

* Lordly

The best synonym to use will depend on the specific context and the particular shade of meaning you wish to convey.