Why had he dared to come with such an impertinent question?

"Those are impertinent questions to the academic issue at hand," said the Doctor.

"Well I'm just telling you that that's a personal, impertinent question."

"A most impertinent question which I shall certainly not answer."

Forgive me for the impertinent questions but this is important.

Even if he was calling the police to report an outsider asking impertinent questions, what could they do to me?

Now you're the one asking impertinent questions, and she's being not there.

He was well within his rights to refuse to answer such an impertinent question.

The young man was asking impertinent questions of the teacher, and she began to get annoyed.

"You had asked a very impertinent question of the king, and that is not a wise thing to do."