The term "satanical cruelty" refers to the most extreme forms of mercilessness, where the perpetrator enjoys inflicting pain or suffering on others. When describing such actions, there are several synonyms that can appropriately convey the atrocity. Brutality, sadism, inhumanity, savagery, and barbarism are words that come to mind when speaking of the devilish cruelty perpetuated by certain individuals. The term "inhumane" is also often used to describe such acts of violence, which are devoid of compassion or dignity. Overall, these terms underline the heinous nature of such actions and the lack of empathy or humanity displayed by those who commit them.