to treat a person or animal with cruelty or violence, or the act of such treatment

to wreak havoc; to devastate

extremely cruel, violent, or savage in nature or behavior

helping an evildoer commit crimes or taking the side of an oppressor; giving succor to the enemy

to maltreat; to tyrannize

the tendency to derive pleasure from one's own pain, suffering, or humiliation

characterized by or showing extreme cruelty and brutality

(idiom) tyrannical; oppressive; lawless

sadism (fetish)

to tease or mock someone playfully without being offensive or malicious

to torment or abuse (an animal, child, etc.)

to suffer abuse, particularly of a physical or sexual nature

the psychological condition or behavior of deriving pleasure from inflicting pain or suffering on others

heartbreaking; tear-jerking

a torturous romantic relationship or love affair involving mutual emotional suffering

to kill or assault in a sadistic and brutal manner

to convincingly defeat; to significantly outperform

sado-masochism

sadism (psychiatry)

a person who treats another person or animal with cruelty or violence