Will spoke at random: he was merely venting his petulance; it was a little too exasperating to have his grandmother’s portrait offered him at that moment.
She seated herself on a dark ottoman with the brown books behind her, looking in her plain dress of some thin woollen-white material, without a single ornament on her besides her wedding-ring, as if she were under a vow to be different from all other women; and Will sat down opposite her at two yards’ distance, the light falling on his bright curls and delicate but rather petulant profile, with its defiant curves of lip and chin.
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.