Otherworldly, Ghostly, Heavenly
Puzzle 15 of Yoga Hard Pack
Question is: Otherworldly, Ghostly, Heavenly
and the answer is: ETHEREAL
Word Meaning:
ETHEREAL — Pertaining to the presupposition of an invisible air-like element permeating all of space, or to the higher regions beyond the earth or beyond the atmosphere.
Definitions from Wiktionary.