The Oxford Thesaurus An A-Z Dictionary of Synonyms - arrogantadj.

1) presumptuous, assuming, self-assertive, conceited, egotistical, pompous, superior, brazen, bumptious, cavalier: It would be most arrogant of me to take for myself the glory that rightfully belongs to the whole team. 2) haughty, overbearing, imperious, high-handed, overweening, disdainful, contemptuous, scornful, snobbish, supercilious, lofty, swaggering , Brit toffee-nosed; Colloq uppity, on one's high horse, high and mighty, snotty: Since her husband was made a company director, she's become unbearably arrogant.