We should not say a bad word about anyone.

我们不应该说任何人的坏话。

youdao

It's impolite to say a bad word about anyone behind him.

在别人背后说他的坏话是不礼貌的。

youdao

"Marky was partial to a few drinkies, but he was a kind man with a big heart and never had a bad word to say about anyone, " a statement read.

BBC: Taxi passenger sought in Mark Austin murder inquiry

James never had a bad word to say about anyone and was so kind and considerate.

BBC: Funeral for Royal Marine James Wright in Weymouth