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Adjective: unutterable  ,ún'ú-tu-ru-bul
  1. Too sacred to be uttered
    - ineffable, unnameable, unspeakable, unsayable
     
  2. Defying expression or description
    "unutterable contempt";
    - indefinable, indescribable, ineffable, unspeakable, untellable
     
  3. Very difficult to pronounce correctly
    "unutterable consonant clusters";
    - unpronounceable

See also: incommunicative, inexpressible, sacred, uncommunicative, unexpressible