The term "tyrannical" refers to a form of governance or behavior that is oppressive, harsh and unreasonable. It describes someone who has an excessive desire for power and control over others, often using fear and intimidation to maintain their authority. A tyrannical ruler or leader may disregard the rights and well-being of those they govern in favor of their own selfish desires, leading to a lack of freedom, justice and fairness for the people being ruled.