tyrannical (adj.)youdaoicibaDictYouDict[tyrannical 词源字典]
1530s, from Latin tyrannicus "arbitrary, despotic," from Greek tyrannikos "befitting a despot," from tyrannos (see tyrant) + -al (1). Tyrannic was used in this sense from late 15c. Related: Tyrannically.[tyrannical etymology, tyrannical origin, 英语词源]