Synonyms and related words :
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