authoritarian
autocratic
dictatorial
despotic
tyrannic
tyrannical
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
overbearing
expecting unquestioning obedience
the timid child of authoritarian parents
insufferably overbearing behavior toward the waiter
dictator
a person who behaves in a tyrannical manner
my boss is a dictator who makes everyone work overtime