tyrannical

/tɪˈrænɪkəl/
adjective
  1. Exercising power in a cruel, unjust, or oppressive way; like a tyrant.
    • The tyrannical boss demanded that everyone work 12-hour days without breaks.
    • Citizens protested against the tyrannical laws that took away their freedom.
    • Her tyrannical parenting style left her children afraid to express their opinions.