air-built
airy
astral
chimerical
cloud-built
dreamlike
ectoplasmic
ethereal
etheric
fanciful
fatuitous
fatuous
gaseous
ghostish
ghostlike
ghostly
ghosty
gossamery
illusory
imaginary
incorporeal
phantasmal
phantasmic
phantom
phantomic
psychic
rarefied
shadowy
specterlike
spectral
spiritual
spirituous
subtile
subtle
supernatural
vaporous
windy
wraithlike
wraithy