tyrannically
ty-ran-ni-cal-ly
adverb
In a cruel, oppressive, or unjustly controlling manner, characteristic of a tyrant.
"The dictator ruled tyrannically, suppressing all dissent."
Thesaurus
Synonyms: despotic, tyrannical, autocratic, tyrannic, undemocratic, dictatorial, authoritarian, oppressive, domineering, tyrannous