He's underhanded 他很阴险

Underhanded means sneaky or dishonest. You can be underhanded, or you can do something underhanded, such as telling your boss a lie so your co-worker doesn't get a promotion.

Underhanded的意思是阴险的，秘密的。比如你向你的老板撒谎，让你的同事得不到晋升

例句:

He's underhanded, you just can't trust him.他很阴险，你不能相信他。