tyrannical

Adjective

• characteristic of an absolute ruler or absolute rule; having absolute sovereignty
  • an authoritarian regime
    
  • autocratic government
    
  • despotic rulers
    
  • a dictatorial rule that lasted for the duration of the war
    
  • a tyrannical government
    

• marked by unjust severity or arbitrary behavior
  • the oppressive government
    
  • oppressive laws
    
  • a tyrannical parent
    
  • tyrannous disregard of human rights
    

Related words

• Synonyms: 
  authoritarian , autocratic , dictatorial , despotic , tyrannic , oppressive , tyrannous