Adjective: impertinent im'pur-tu-nunt or im'purt-nunt
- Improperly forward or bold
"impertinent of a child to lecture a grownup";
- fresh, impudent, overbold, smart, saucy [informal], sassy [N. Amer, informal], wise, lippy [informal]
- Not pertinent to the matter under consideration
"mentioned several impertinent facts before finally coming to the point";
- extraneous, immaterial, orthogonal
- Lively and humorously cheeky or forward
"a certain impertinent gaiety and ease of manner";
- irreverent, pert, saucy [informal], cheeky [Brit, informal]
See also: beside the point, forward, irrelevant, spirited