He is an ideal opponent for me, never dirty.

对我来说他是个有创造力的对手，踢球不脏。

youdao

I'd never do the dirty on my friends.

我决不出卖朋友。

《牛津词典》

"There was never anything dirty about him," she says. "he was not a pervert."

“他不是一个肮脏的人，”她说，“他也不是一个怪人。”

youdao

I like the way she did that. She never said I was dirty or that I smelled bad.

VOA: special.2009.02.14

The dirty business of physical death never has to take place at all.

肮脏的肉体死了就永远不会发生。

耶鲁公开课 - 弥尔顿课程节选

Consider this: In a clean room, the couch never gets dirty.

FORBES: A New Drug To Treat Alzheimer's?

Once the race began, he was a ruthless competitor (some preferred the term "dirty") who never seemed to go at less than his upper limit.

WSJ: Ayrton Senna | Aggression With Lucidity | By Richard B. Woodward

Mrs Fernandez Meijide, whom many fancy as the alliance's presidential candidate for 1999, lost a son during the dirty war and has never learned his fate.

ECONOMIST: Argentina