It was hardly possible, indeed, that anything else should be talked of, for Mrs. Norris was in high spirits about it; and Mrs. Rushworth, a well-meaning, civil, prosing, pompous woman, who thought nothing of consequence, but as it related to her own and her son’s concerns, had not yet given over pressing Lady Bertram to be of the party.
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