Definition: improperly forward or bold
Usage: don't be fresh with me; impertinent of a child to lecture a grownup; an impudent boy given to insulting strangers; Don't get wise with me!
Definition: not pertinent to the matter under consideration
Usage: an issue extraneous to the debate; the price was immaterial; mentioned several impertinent facts before finally coming to the point
Definition: characterized by a lightly pert and exuberant quality
Usage: a certain irreverent gaiety and ease of manner