The word 'tyrannical' always implies a negative judgment about someone's way of ruling or managing. The company's CEO was often criticized for his tyrannical decision-making style.
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Not Just Politics
'Tyrannical' extends beyond politics to describe any overly controlling situation or person. My supervisor's tyrannical management made working there unbearable.
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Historical Usage
'Tyrannical' is often used in historical contexts to describe rulers with absolute power used unjustly. Historians describe his reign as tyrannical and fraught with injustice.