detached from the (outside) world
Psychologically, emotionally, intellectually, or physically separated from the people, influence, or average thinking of the outside world. He just keeps to himself, never talking to anyone, like he's detached from the world. He builds all of his policies from theory and what he studied in books—it's all completely detached from the outside world. The tiny rural village, totally detached from the outside world, developed a dialect and manner totally unique to the rest of the region.