mystical

Concise Oxford English Dictionary © 2008 Oxford University Press:
mystical/ˈmɪstɪkl/

▶adjective

• 1 relating to mystics or mysticism.

  ■ having a spiritual symbolic or allegorical significance that transcends human understanding.

  ■ relating to ancient religious mysteries or other occult rites.

• 2 inspiring a sense of spiritual mystery, awe, and fascination.

– derivatives
mystically adverb.