impudence, impertinence, cheek, insolence, cheekiness, audacity, temerity, brazenness, forwardness, front, presumption, nerve, gall, pertness, boldness, shamelessness, impoliteness, disrespect, bad manners, unmannerliness, overfamiliarity;

answering back, talking back

informal brass, brass neck, neck, face, lip, mouth, cockiness

British informal sauce

Scottish informal snash

North American informal sass, sassiness, nerviness, chutzpah, back talk

informal, dated hide

British informal, dated crust, backchat

rare malapertness, contumely, procacity, assumption

dare, make so bold as, be so bold as, presume, have the temerity, have the audacity, have the nerve, be brave enough, have the courage, go so far as;

take the liberty of