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adjective. The definition of tyrannical is cruel and unjust power or control. An evil dictator is an example of a leader that would be described as tyrannical.
Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  dictatorially, autocratically, magisterially(adverb) in an overbearingly domineering manner; as a dictator. this manager acts dictatorially toward his colleagues. 2  autocratically(adverb) in an autocratic manner. the Czars ruled Russia autocratically.