The man was a sadist who tortured animals and people.

这个男人是个施虐狂，折磨动物也折磨人。

《柯林斯英汉双解大词典》

Instead, I imagined him calling the policeman a stupid idiot, a spineless coward, a sadist, a bastard, and I imagined the shock of the policemen the chief staring openmouthed, the other cellmates stunned at the audacity of the boy from the university.

NEWYORKER: Cell One

As Hanssen, he is formidable, saturnine, humorless a pious sadist who likes to put people on the spot.

NEWYORKER: Double Lives