Synonyms of 'incommunicable'
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You use indescribable to emphasize that a quality or condition is very intense or extreme, and therefore cannot be properly described.
The stench from the sewer is indescribable.
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
Thesaurus for incommunicable from the Collins English Thesaurus
incapable of being communicated