(n.) A Brazen-faced; impudent; bold.

arrogant audacious biggety bluff bold brash brassy brazen bumptious challenging chutzpadik cocky contemptuous crusty daring defiant defying derisive disdainful disregardful disrespectful facy flip flippant forward fresh gally gratuitous greatly daring impertinent impudent insolent malapert nervy pert regardless of consequences rude sassy saucy smart smart-alecky smart-ass uncalled-for uncivil wise-ass