adjective

having an impetuous or quick-tempered nature.

a hot-headed youth

impetuous,impulsive,headstrong,reckless,rash,irresponsible,foolhardy,madcap,wild,excitable,volatile,precipitate,overhasty,unruly,fiery,hot-tempered,quick-tempered,harum-scarum,crazy,crackpot,hasty