I've had a devil of a job finding you.

我费了九牛二虎之力才找到你。

《牛津词典》

And if not, is he a devil?

如果不是，他是不是一个魔鬼？

youdao

Yet one of you is a devil!

但你们中间有一个是魔鬼。

youdao

But he said this about Hell: "I have made a deal with the devil.

VOA: special.2009.03.22

It's deemed you have been possessed by the devil, or put out on the street, a shame to your family and really left to live very subhuman lives."

VOA: special.2010.07.28

One rebel called "Devil" chopped the baby in half with a machete.

VOA: standard.2010.06.07

Likewise, assigning at least one group member to be a devil's advocate can have a positive effect.

FORBES

For all of his reputation, however, he's had a devil of a time figuring out the American economy.

FORBES: Magazine Article

Jason realizes he's made a devil's bargain and that Kurt must be stopped.

FORBES: Correction Appended