dictatorial -- (of or characteristic of a dictator; "dictatorial powers")
authoritarian, dictatorial, overbearing -- (expecting unquestioning obedience; "the timid child of authoritarian parents"; "insufferably overbearing behavior toward the waiter")
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")