Definitions of dictatorial:

• adjective:   of or characteristic of a dictator

  Example: "Dictatorial powers"

• adjective:   likened to a dictator in severity
• adjective:   expecting unquestioning obedience

  Example: "He was imperious and dictatorial"

• adjective:   characteristic of an absolute ruler or absolute rule; having absolute sovereignty

  Example: "A dictatorial rule that lasted for the duration of the war"