Definition of tyrannical adjective from the Oxford Advanced Learner's Dictionary

 

tyrannical

 adjective
adjective
BrE BrE//tɪˈrænɪkl//
 
; NAmE NAmE//tɪˈrænɪkl//
 
(formal tyrannous
BrE BrE//ˈtɪrənəs//
 
; NAmE NAmE//ˈtɪrənəs//
 
)
 
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using power or authority over people in an unfair and cruel way synonym autocratic, dictatorial tyrannical power a tyrannical government He was brought up by a cruel and tyrannical father. His reputation as a tyrannical captain made it hard to find a crew. Word Origin mid 16th cent.: from Old French tyrannique, via Latin from Greek turannikos, from turannos.
See the Oxford Advanced American Dictionary entry: tyrannical