Synonyms and related words :
aggressively self-confident, arrogant, audacious, biggety, brassy, brazen, challenging, cheeky, chesty, cocky, cold, conceited, contemptuous, contumelious, cool, daring, defiant, defying, derisive, disdainful, disregardful, familiar, forward, greatly daring, hubristic, immodest, impertinent, impudent, insolent, insulting, know-it-all, obtrusive, overpresumptuous, overweening, overwise, peacockish, peacocky, perk, perky, pert, presuming, presumptuous, procacious, puffed up, pushy, regardless of consequences, saucy, self-conceited, self-opinionated, smart-alecky, stuck-up, swelled-headed, uppish, uppity