autocratic
au-to-crat-ic
adjective
Exercising absolute power; characteristic of a dictator or tyranny.
"The autocratic leader suppressed all dissent ruthlessly."
Thesaurus
Synonyms: despotic, tyrannical, tyrannic, undemocratic, dictatorial, authoritarian, magisterial, domineering, dominating, bossy, peremptory, high-and-mighty