See malapert in Webster's New World Roget's A-Z Thesaurus II
adjective
Rude and disrespectful:
assuming, assumptive, audacious, bold, boldfaced, brash, brazen, cheeky, contumelious, familiar, forward, impertinent, impudent, insolent, nervy, overconfident, pert, presuming, presumptuous, pushy, sassy, saucy, smart. (Informal) brassy, flip, fresh, smart-alecky, snippety, snippy, uppish, uppity. (Slang) wise1. See attitude, courtesy
noun
One who is obnoxiously self-assertive and arrogant:
witling. (Informal) know-it-all, saucebox, smart aleck, smarty, smarty-pants, wisenheimer. (Slang) wiseacre, wisecracker, wise guy. See good
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