Synonyms of 'incommunicable'
indescribableDictionary, unspeakable, ineffable
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You use ineffable to say that something is so great or extreme that it cannot be described in words.
the ineffable sadness of many of the portraits
An inexpressible feeling cannot be expressed in words because it is so strong.
He felt a sudden inexpressible loneliness.
If you describe something as unspeakable, you are emphasizing that it is extremely unpleasant.
the unspeakable horrors of chemical weapons
from hell (informal)
hellacious (US , slang)
too horrible for words
Thesaurus for incommunicable from the Collins English Thesaurus
incapable of being communicated