ghostlike

from WordNet (r) 3.0 (2006)

ghostlike
    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

Ghostlike \Ghost"like`\, a.
   Like a ghost; ghastly.
   [1913 Webster]