imperious vs supercilious

imperious and supercilious both are adjectives.

Word	Noun	Adjective	Verb	Adverb
imperious	No	Yes	No	No
supercilious	No	Yes	No	No

As adjectives, imperious and supercilious are synonyms defined as:

imperious and supercilious: having or showing arrogant superiority to and disdain of those one views as unworthy

Other synonyms of imperious include disdainful, haughty, lordly, overbearing, prideful, sniffy, swaggering.

imperious (adjective)	supercilious (adjective)
having or showing arrogant superiority to and disdain of those one views as unworthy	having or showing arrogant superiority to and disdain of those one views as unworthy
	expressive of contempt