Petulant means sulky and bad-tempered over small things. A petulant reply, petulant and rude, sound petulant.
It carries an accusation of childishness, which is what makes it such a cutting word about an adult. It is about the size of the provocation rather than the strength of the reaction.
1adjectivepetulantSulky and bad-tempered over small things.
“The petulant footballer kicked the ball away when the referee gave a free kick against him.”
petulant is a quality.
Latin petulans means impudent, related to petere, to seek or attack.
Proto-Indo-European
*peth₂-
Latin
petulāns
English, today
petulant
Built from
From Middle French -, from Latin petulāns, akin to petō (“to ask for”).
Etymology from Wiktionary, CC BY-SA