definition of
tyrannical

[1] #1 tyrannical s. [oppressive, tyrannous] marked by unjust severity or arbitrary behavior; "the oppressive government"; "oppressive laws"; "a tyrannical parent"; "tyrannous disregard of human rights". wn

[2] #2 tyrannical s. [authoritarian, autocratic, dictatorial, despotic, tyrannic] 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". wn