otherworldly

Short definition from Wiktionary

Adjective

1. 1
   Of, concerned with, or preoccupied with a world different from the tangible world, especially a fantasy, imaginary, or mystical world.
2. 2
   Of, concerned with, or preoccupied with a world different from the tangible world, especially a fantasy, imaginary, or mystical world: Odd and unfamiliar; strange, uncanny, weird.
3. 3
   Of, concerned with, or preoccupied with spiritual matters.
4. 4
   Of or relating to the imagination or intellect.