ineffable

[in-ef-uh-buhl]
adjective
1.
incapable of being expressed or described in words; inexpressible: ineffable joy.
2.
not to be spoken because of its sacredness; unutterable: the ineffable name of the deity.

Origin:
1400–50; late Middle English < Latin ineffābilis. See in-3, effable

ineffability, ineffableness, noun
ineffably, adverb


2. unspeakable.
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World English Dictionary
ineffable (ɪnˈɛfəbəl)
 
adj
1.  too great or intense to be expressed in words; unutterable
2.  too sacred to be uttered
3.  indescribable; indefinable
 
[C15: from Latin ineffābilis unutterable, from in-1 + effābilis, from effārī to utter, from fārī to speak]
 
ineffa'bility
 
n
 
in'effableness
 
n
 
in'effably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

ineffable
mid-15c., from Fr. ineffable (14c.), from L. ineffabilis "unutterable," from in- "not" + effabilis "speakable," from effari "utter," from ex- "out" + fari "speak" (see fame).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
One way to get a grip on this seemingly ineffable property would be to build a
  conscious machine.
She is a supremely lucid and sublimely beguiling poet, as accessible as she is
  ineffable.
The ineffable sensation of freedom remains vivid decades later.
In that mystery lurks the world's ineffable potential for good.
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