ineffable

(s) defying expression or description
- indefinable yearnings
- indescribable beauty
- ineffable ecstasy
- inexpressible anguish
- unspeakable happiness
- unutterable contempt
- a thing of untellable splendor
indescribable, unspeakable, untellable, indefinable, unutterable,
(s) too sacred to be uttered
- the ineffable name of the Deity
unnameable, unutterable, unspeakable,

indescribable unspeakable untellable indefinable unutterable unnameable

ineffably