phantasmal

from WordNet (r) 3.0 (2006)

phantasmal
    adj 1: resembling or characteristic of a phantom; "a ghostly
           face at the window"; "a phantasmal presence in the room";
           "spectral emanations"; "spiritual tappings at a seance"
           [syn: {apparitional}, {ghostlike}, {ghostly},
           {phantasmal}, {spectral}, {spiritual}]

from The Collaborative International Dictionary of English v.0.48

Phantasmal \Phan*tas"mal\, a.
   Pertaining to, of the nature of, or resembling, a phantasm;
   spectral; illusive.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

65 Moby Thesaurus words for "phantasmal":
      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