Synonyms of 'inexpressible'
He felt a sudden inexpressible loneliness.
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incapable of being communicated
An indefinable quality or feeling cannot easily be described.
There was something indefinable in her eyes.
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.
Thesaurus for inexpressible from the Collins English Thesaurus
An inexpressible feeling cannot be expressed in words because it is so strong.