He treats her sadistically.

他虐待她。

youdao

And scaring people by sadistically exaggerating the perils, if only in retrospect, increases his credit.

ECONOMIST: It might win Gordon Brown an election. But then what?

Describing the "horrific" killings, Judge Mr Justice Field told Farrow he had "acted sadistically".

BBC: Stephen Farrow

Many have seen close relations sadistically murdered, and walked past piles of newly slaughtered, often mutilated, bodies.

ECONOMIST: Bombs over Belgrade, diplomatic as well as military