unutterable

Adjective
  1. Too sacred to be uttered (synset 302063021)
    "the ineffable name of the Deity"
  2. Defying expression or description (synset 300947318)
    "indefinable yearnings"; "indescribable beauty"; "ineffable ecstasy"; "inexpressible anguish"; "unspeakable happiness"; "unutterable contempt"; "a thing of untellable splendor"
  3. Very difficult to pronounce correctly (synset 300503910)
    "an unpronounceable foreign word"; "unutterable consonant clusters"

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