malapert

adj.
Impudently bold in speech or manner; saucy.

n.
An impudent, saucy person.

[Middle English, from Old French : mal-, mal- + apert, clever, alteration (influenced by apert, clever, saucy; see pert), of Latin expertus. See expert.]

malapertly mal'a·pert'ly adv.
malapertness mal'a·pert'ness n.

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/good attitude/bad attitude/neutral attitude, courtesy/discourtesy.

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/bad.

impudently bold: saucy