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Adjective: ineffable  in'e-fu-bul
  1. Defying expression or description
    "ineffable ecstasy";
    - indefinable, indescribable, unspeakable, untellable, unutterable, undescribable
  2. Too sacred to be uttered
    "the ineffable name of the Deity";
    - unnameable, unspeakable, unutterable, unsayable

See also: inexpressible, sacred, unexpressible

Encyclopedia: Ineffable