See synonyms for tyranny on

noun, plural tyr·an·nies.

arbitrary or unrestrained exercise of power; despotic abuse of authority.the government or rule of a tyrant or absolute ruler.a state ruled by a tyrant or absolute ruler.oppressive or unjustly severe government on the part of any ruler.undue severity or harshness.a cruel or harsh act or proceeding; an arbitrary, oppressive, or tyrannical action.