(a.) Pertaining to, of the nature of, or resembling, a phantasm; spectral; illusive.

Barmecidal Barmecide aerial air-built airy apparent apparitional astral autistic chimeric cloud-born cloud-built cloud-woven deceptive delusional delusionary delusive delusory dereistic dreamlike dreamy ectoplasmic erroneous ethereal etheric fallacious FALSE fantastic ghostish ghostlike ghostly ghosty illusional illusionary illusive illusory imaginary incorporeal misleading ostensible phantasmagoric phantasmic phantom phantomic phantomlike psychic seeming self-deceptive self-deluding shadowy specious specterlike spectral spiritual supernatural supposititious unactual unfounded unreal unsubstantial vaporous vapory visionary wraithlike wraithy