petulancy

/ˈpɛtʃələnsi/
noun
  1. A less common variant of petulance; childish irritability or bad temper.
    • The customer's petulancy over the long wait was understandable.
    • She tried to hide her petulancy, but her frown gave her away.
    • His petulancy was obvious when he stomped his foot.
Antonyms