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Adjective: unspeakable  ,ún'spee-ku-bul
  1. Defying expression or description
    "unspeakable happiness";
    - indefinable, indescribable, ineffable, untellable, unutterable, undescribable
  2. Exceptionally bad or displeasing
    "an unspeakable odour came sweeping into the room";
    - atrocious, abominable, awful, dreadful, painful, terrible, horrible
  3. Too sacred to be uttered
    "the unspeakable name of the Deity";
    - ineffable, unnameable, unutterable, unsayable
  4. Not capable of being said
    - unsayable

See also: bad, inexpressible, sacred, unexpressible

Encyclopedia: Unspeakable