nonexistent

from WordNet (r) 3.0 (2006)

nonexistent
    adj 1: not having existence or being or actuality; "chimeras are
           nonexistent" [ant: {existent}, {existing}]

from The Collaborative International Dictionary of English v.0.48

Nonexistent \Non`ex*ist"ent\, a.
   Not having existence.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

46 Moby Thesaurus words for "nonexistent":
      absconded, absent, away, deleted, departed, devoid, disappeared,
      existless, extinct, fancied, fictive, gone, gone away, illusory,
      imaginary, imaginational, imagined, lacking, lost, lost to sight,
      lost to view, minus, missing, negative, no longer present, no more,
      nonattendant, not found, not present, notional, null, omitted,
      out of sight, past and gone, subtracted, supposititious,
      taken away, unactual, unexisting, unreal, vacuous, vanished,
      visional, void, wanting, without being