This is pure slander and I'll Sue him for defamation if he doesn't apologize.

这纯属污蔑，如果他不向我道歉，我就控告他诽谤。

《新英汉大辞典》

I detest him for he often goes out of his way to slander others.

我很讨厌他，因为他经常特别喜欢诽谤别人。

youdao

He is so beyond suspicion that no slander can stick to him.

他是无可怀疑的，任何诽谤都无法附著在他身上。

youdao

The case went to trial with lightning speed, and last week a court in Almaty convicted Mr Abilov of slander, giving him an 18-month suspended sentence.

ECONOMIST: A setback for the opposition