immaterial
nonmaterial
unidentifiable
aerial
aeriform
airy
asomatous
astral
atomic
bodiless
corpuscular
decarnate
decarnated
dim
discarnate
disembodied
eluding
elusive
embryonic
ethereal
evanescent
evasive
extramundane
fleeting
germinal
ghostly
granular
impalpable
imperceptible
imponderable
imprecise
inappreciable
incorporate
incorporeal
indefinite
indiscernible
infinitesimal
insensible
insubstantial
intactile
invisible
microcosmic
microscopic
molecular
nonphysical
nonsubstantial
obscure
contradictory
formless
impersonal
incalculable
incomprehensible
indefinable
mystical
shadowy
subtle
tangible
tenuous
undefined
unreal