Open English Wordnet
Adjectives
(s)oppressive, tyrannical, tyrannousmarked by unjust severity or arbitrary behavior“the oppressive government”, “oppressive laws”, “a tyrannical parent”, “tyrannous disregard of human rights”
(s)authoritarian, autocratic, dictatorial, despotic, tyrannic, tyrannicalcharacteristic 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”