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