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1. Impossible to be transmitted; not communicable: an incommunicable disease.
2. Incommunicative: an executive who was maddeningly incommunicable.

in′com·mu′ni·ca·bil′i·ty n.
in′com·mu′ni·ca·bly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. incapable of being communicated
2. an obsolete word for incommunicative
ˌincomˌmunicaˈbility, ˌincomˈmunicableness n
ˌincomˈmunicably adv
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌɪn kəˈmyu nɪ kə bəl)

1. incapable of being communicated or imparted: an incommunicable secret.
2. uncommunicative; taciturn.
[1560–70; < Late Latin]
in`com•mu`ni•ca•bil′i•ty, in`com•mu′ni•ca•ble•ness, n.
in`com•mu′ni•ca•bly, adv.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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2. That cannot be described:
Idioms: beyond description, defying description.
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
Whatever we had missed, we possessed together the precious, the incommunicable past.
Each silent worshipper seemed purposely sitting apart from the other, as if each silent grief were insular and incommunicable. The chaplain had not yet arrived; and there these silent islands of men and women sat steadfastly eyeing several marble tablets, with black borders, masoned into the wall on either side the pulpit.
There was a nameless and incommunicable fear that rested upon all.
And how nobly it raises our conceit of the mighty, misty monster, to behold him solemnly sailing through a calm tropical sea; his vast, mild head overhung by a canopy of vapor, engendered by his incommunicable contemplations, and that vapor --as you will sometimes see it --glorified by a rainbow, as if Heaven itself had put its seal upon his thoughts.
Michael, his forefeet on the gunwale, barked to him in a puzzled, questioning sort of way, and Jerry whimpered back incommunicable understanding.
The word gentleman, which, like the word Christian, must hereafter characterize the present and the few preceding centuries by the importance attached to it, is a homage to personal and incommunicable properties.
And it would seem to Michael that on one side, clinging to him, Cocky talked farrago in his ear, and on the other side Sara clung to him and chattered an interminable and incommunicable tale.
It was the masterful and incommunicable wisdom of eternity laughing at the futility of life and the effort of life.
Even if there be no true knowledge, as is proved by 'the wretched state of education,' there may be right opinion, which is a sort of guessing or divination resting on no knowledge of causes, and incommunicable to others.
She sighed, teased by desires so incoherent, so incommunicable.
There was now in the breast of Reuben Bourne an incommunicable thought--something which he was to conceal most heedfully from her whom he most loved and trusted.
The Sphinx is not so incommunicable. He is a mask with a manner.