I won’t hear it spoken of," said the princess in the same petulantly playful tone in which she had spoken to Hippolyte in the drawing room and which was so plainly ill-suited to the family circle of which Pierre was almost a member.
There are no more uses of "petulant" in the book.
Show samples from other sources
She stomped her foot like a petulant child.
She is petulant by nature and was clearly insulted by the question.