Unutterable (9)

I believe the answer is:

ineffable

'unutterable' is the definition.
(synonyms)

This is all the clue.

(Other definitions for ineffable that I've seen before include "Inexpressible" , "Too great to be put into words" , "beyond description" , "Indescribable in words" , "Beyond words" .)

I've seen this clue in the Evening Standard and The Independent.

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