sol-ip-sis-tic: (adjective) Extreme preoccupation with and indulgence of one's feelings, desires, etc.; egoistic, self-absorption.
I stumbled across this word today in an article in the Toronto Star and I am going to use it EVERY chance I get. There's something incredibly self-satisfying (solipsistic, even?) calling someone arrogant and egotistical with a word that they most likely will not only not know the definition of, but will have never heard before.
THIS is why I love words.