"Mine, master shaver," said Don Quixote, "will not be impertinent, but, on the contrary, pertinent."
There are no more uses of "pertinent" in the book.
Show samples from other sources
After the accident, we frequently had little chats about Mia’s progress and passed along pertinent info to her grandparents.
Gayle Forman -- Where She Went
I have no idea what he said, but it must have been pertinent, for she scrambled to her feet, shook herself, and bounced amiably after him as he went to sniff at the slumbering forms of Uncle Albert and the Stranger.