What's make a good super villain?

[turtlefanforever]

or main antagonist. Doesn't have to have powers. There seems to be a general outline for what is expected but what do you think makes a good villain? a compelling villain?

[Mzx10484]

A mixture of impressive appearance, fairly intelligent and combat power.

[Davetello]

Above all - the ability to psychologically torment the hero, as well as others. But mainly the hero. The Joker is a great example of this.