WordNet sense 1 (of heaven or the spirit):

celestial, supernal

WordNet sense 2 (of or belonging to heaven or god):

heavenly

WordNet sense 3 (characterized by unusual lightness and delicacy):

gossamer

WordNet sense 4 (exquisitely fine and subtle and pleasing; susceptible to injury):

delicate

WordNet sense 5 (characterized by lightness and insubstantiality; as impalpable or intangible as air):

aerial, airy, aeriform, aery, aerial

WordNet sense 6 (lacking material form or substance; unreal):

insubstantial, unreal