"tyrannical" in the adjective sense
1. oppressive, tyrannical, tyrannous
marked by unjust severity or arbitrary behavior
"the oppressive government"
"oppressive laws"
"a tyrannical parent"
"tyrannous disregard of human rights"
2. authoritarian, autocratic, dictatorial, despotic, tyrannic, tyrannical
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"
Source: WordNet® (An amazing lexical database of English)
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