Synonyms of 'inexpressible'
indescribableDictionary, unspeakable, indefinable
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.
Thesaurus for inexpressible from the Collins English Thesaurus
An inexpressible feeling cannot be expressed in words because it is so strong.