WordWeb Online

1. Of or characteristic of a dictator
   "dictatorial powers"
    
2. Expecting unquestioning obedience
   - authoritarian, overbearing
    
3. Characteristic of an absolute ruler or absolute rule; having absolute sovereignty
   "a dictatorial rule that lasted for the duration of the war"
   - authoritarian, autocratic, despotic, tyrannic, tyrannical

See also: dictator, dictatorially, domineering, undemocratic

Encyclopedia: Dictatorial