With the Judge’s sons, hunting and tramping, it had been a working partnership; with the Judge’s grandsons, a sort of pompous guardianship; and with the Judge himself, a stately and dignified friendship.
There are no more uses of "pompous" in the book.
Show samples from other sources
She gave another pompous speech.
"Well done, Ron, excellent," said Percy Weasley pompously as "Zabini, Blaise," was made a Slytherin.
J.K. Rowling -- Harry Potter and the Sorcerer’s Stone