If something is slippery, it is wet or smooth so that it slides easily or causes something to slide.

slippery soap 湿滑的肥皂

a slippery floor 湿滑的地板

The road was wet and slippery. 道路又湿又滑。

Someone who is slippery cannot be trusted.

He's as slippery as an eel - you can never get a straight answer out of him. 他非常滑头——你永远无法从他嘴里得到直率的回答。

He's a slippery customer (= person), and I've never felt comfortable with him. 他是个狡猾的家伙，和他在一起我总是感到不舒服。