A cruel and oppressive ruler who exercises absolute power unjustly or cruelly.

El pueblo se rebeló contra el tirano que gobernaba el país. // The people rebelled against the tyrant who ruled the country.

Characterized by or exercising oppression, cruelty, or unjust severity.

Su jefe era tirano y trataba mal a los empleados. // His boss was tyrannical and treated the employees poorly.