An Unfriendly Artificial Intelligence is a Strong AI capable of causing great harm to humanity, and having goals that make it useful for the AI to do so. The AI's goals don't need to be antagonistic to humanity's goals for it to be Unfriendly. Paperclip maximizer is an extreme example of Unfriendly AI that is indifferent to humanity. The concept of Unfriendly AI is contrasted by the concept of Friendly AI.