otherworldly

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of, relating to, or characteristic of another world, especially a mystical or transcendental world.
• adjective Devoted to the world of the mind; concerned with intellectual or imaginative things.
• adjective Concerned with an afterlife, especially when inattentive to the present.

from The Century Dictionary.

• Governed in this life by motives relating to the consideration of existence in another and better world.

from the GNU version of the Collaborative International Dictionary of English.

• adjective existing outside of or not in accordance with nature.
• adjective Not worldly; preparing for or concerned primarily with the afterlife; -- of people.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Of, concerned with, or preoccupied with a different world than that of the tangible here and now, such as a heavenly, spiritual, or imaginary world.
• adjective Not belonging to the real world; unnatural; odd and unfamiliar.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective existing outside of or not in accordance with nature