insolent, ill-mannered. / irrelevant, useless.

An impertinent individual.

In an impertinent manner.

plural of impertinent

The quality of being impertinent.

(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.

plural of impertinence

Irrelevancy; impertinence. / Absurdity; inappropriateness. / Insolence.

plural of impertinency