unutterable

(s) too sacred to be uttered
- the ineffable name of the Deity
unnameable, ineffable, unspeakable,
(s) defying expression or description
- indefinable yearnings
- indescribable beauty
- ineffable ecstasy
- inexpressible anguish
- unspeakable happiness
- unutterable contempt
- a thing of untellable splendor
indescribable, ineffable, unspeakable, untellable, indefinable,
(s) very difficult to pronounce correctly
- an unpronounceable foreign word
- unutterable consonant clusters
unpronounceable,

unnameable ineffable unspeakable indescribable untellable indefinable unpronounceable

unutterably