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

1) forward, brash, brazen, cheeky, insolent, impertinent, flippant, saucy, bold, presumptuous, impudent, disrespectful, audacious, rude, impolite, uncivil, ill-mannered, unmannerly, Archaic malapert, Colloq fresh, flip, out of line, brassy, big-mouthed, wise-guy, Slang Brit smart-arsed, US smart-ass(ed) , wise-ass(ed) : He's a clever child, but I don't like his pert manner. 2) lively, jaunty, ebullient, vivacious, enthusiastic, bouncy, sprightly, brisk, cheerful, jolly, bright, perky, animated, nimble: She is usually quite pert in the morning, becoming depressed as the day wears on.