assured, bigheaded, complacent, conceited, consequential, egoistic (also egoistical), egotistic (or egotistical), important, overweening, pompous, prideful, proud, self-conceited, self-important, self-satisfied, smug, stuck-up, swellheaded, vain, vainglorious;
arrogant, bumptious, cavalier, chesty, disdainful, haughty, high-and-mighty, high-hat, huffy, lofty, lordly, masterful, pontifical, self-asserting, self-assertive, snobbish, snobby, snooty, supercilious, superior, toplofty (also toploftical), uppish, uppity;
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