He was a wicked musician.
- C'était un musicien méchant.
That was wicked of him.
- C'était méchant de sa part.
She's nasty and mean.
- Elle est méchante et radine.
His brother was nasty to me.
- Son frère était méchant avec moi.
She was unkind to him.
- Elle était méchante envers lui.