tyr⋅an⋅ny
–noun, plural -nies. 1. arbitrary or unrestrained exercise of power; despotic abuse of authority. 2. the government or rule of a tyrant or absolute ruler. 3. a state ruled by a tyrant or absolute ruler. 4. oppressive or unjustly severe government on the part of any ruler. 5. undue severity or harshness. 6. a tyrannical act or proceeding.