How do I reject a married man gracefully?

Normally I wouldn't care about being nice or graceful to a scumbag like him, but since we have to work together, I'm trying to keep the drama on low.

i'm cool with his wife and he knows I know her.that didn't stop him from trying to get at me. We work in different departments but at the same company so how can I get his thirsty ass to back off without her finding out and hating me, and without him getting vengeful and trying to start sh*t because I rejected him?
How do I reject a married man gracefully?
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