Synonyms and related words :
aerial, aeriform, airy, asomatous, astral, atomic, bodiless, corpuscular, decarnate, decarnated, dim, discarnate, disembodied, eluding, elusive, embryonic, ethereal, evanescent, evasive, extramundane, fleeting, germinal, ghostly, granular, immaterial, impalpable, imperceptible, imponderable, imprecise, inappreciable, incorporate, incorporeal, indefinite, indiscernible, infinitesimal, insensible, insubstantial, invisible, microcosmic, microscopic, molecular, nonmaterial, nonphysical, nonsubstantial, obscure, occult, otherworldly, phantom, psychic, rare, shadowy, slender, slight, spiritual, subatomic, supernatural, tenuous, thin, transmundane, ultramicroscopic, unapparent, unappreciable, unconcrete, unearthly, unembodied, unextended, unfleshly, unobservable, unperceivable, unphysical, unseeable, unsolid, unsubstanced, unsubstantial, unworldly, vague, vaporous, weightless