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Adjective: unsayable  ,ún'sey-u-bul
  1. Too sacred to be uttered
    "the unsayable name of the Deity";
    - ineffable, unnameable, unspeakable, unutterable
     
  2. Not capable of being said or expressed
    "The horror of the situation was unsayable";
    - unspeakable

See also: sacred