As a noun impertinence
is (uncountable) lack of pertinence; irrelevance.
As an adjective impudent is
not showing due respect; impertinent; bold-faced.
(uncountable) Lack of pertinence; irrelevance.
(countable) An instance of this; a moment of being impertinent.
(uncountable) The fact or character of being out of place; inappropriateness.
Not showing due respect; impertinent; bold-faced
- The impudent children would not stop talking in class.
* See also