phantomlike (?.)

• 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