smart mouth (noun) impertinence: boldness
Sinonime: assurance,
audacity, back talk, backchat, brazenness, cheek,
chutzpah*, come-back, crust,
disrespect, disrespectfulness, effrontery, forwardness, freshness,
gall, guff, hardihood, impropriety,
impudence, incivility,
insolence, insolency, lip,
nerve, pertness,
presumption, rudeness, sass, smart mouth, wise guy, wisecrack
Antonime: humility,
manners, politeness