hotspur

/ˈhɑtˌspɜr/
noun
  1. A person who is very eager, impulsive, or quick to act, especially in a reckless or angry way.
    • The young knight was a hotspur, always charging into battle without thinking.
    • The coach warned the hotspur on the team to control his temper during the game.
    • My brother is such a hotspur; he quit his job before finding a new one.
Antonyms