unprintable

from WordNet (r) 3.0 (2006)

unprintable
    adj 1: unfit for print because morally or legally objectionable
           or offensive to good taste; "an unprintable epithet";
           "unprintable pictures" [ant: {printable}]

from Moby Thesaurus II by Grady Ward, 1.0

31 Moby Thesaurus words for "unprintable":
      Fescennine, Rabelaisian, bawdy, blue, dirty, filthy, foul,
      foul-mouthed, foul-spoken, foul-tongued, fulsome, impure,
      ithyphallic, lewd, lurid, nasty, obscene, offensive, pornographic,
      raunchy, ribald, salacious, scurrile, scurrilous, smoking-room,
      smutty, sultry, unchaste, unclean, unrepeatable, vile

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