arrogant
assuming, blustering, conceited, contemptuous, disdainful, haughty, high and mighty (informal) high-handed, imperious, insolent, looking down one's nose at, lordly, overbearing, overweening, pompous, presumptuous, pretentious, proud, scornful, supercilious, swaggering, too big for one's boots or breeches, turning up one's nose at, uppish (Brit. informal)
Antonyms
bashful, deferential, diffident, humble, modest, polite, servile, shy, unassuming