intrusive or presumptuous, as persons or their actions; insolently rude; uncivil

a brash, impertinent youth.

not pertinent or relevant; irrelevant

an impertinent detail.

Archaic . inappropriate, incongruous, or absurd.

Obsolete . (of persons) trivial, silly, or absurd.

adjective

kind , mannered , nice , polite , refined , respectful

adjective

arrogant , brash , brassy * , brazen , contumelious , discourteous , disgracious , flip * , forward , fresh , ill-mannered , impolite , impudent , inappropriate , incongruous , inquisitive , insolent , interfering , intrusive , lippy , meddlesome , meddling , nosy * , off base * , offensive , out of line , pert , presumptuous , procacious , prying , rude , sassy * , smart , smart alecky , uncalled-for * , uncivil , ungracious , unmannerly , unsuitable , assuming , assumptive , audacious , bold , boldfaced , cheeky , familiar , malapert , nervy , overconfident , presuming , pushy , sassy , saucy , extraneous , immaterial , inapplicable , disrespectful , flippant , irrelevant