1.
You use ~ to describe someone or something that is very bad and deliberately harmful to people.
She described the shooting as a ~ attack...
She flew at me, shouting how ~ and evil I was.
= evil
ADJ
2.
If you describe someone or something as ~, you mean that they are rather naughty, but in a way that you find attractive or enjoyable.
She had a ~ sense of humour...
ADJ