Crossword Genius

Very much so, but not unspeakably (7)

Ross

I believe the answer is:

utterly

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'very' is the definition.
Both the answer and definition are adverbs. Perhaps there's a link between them I don't understand?

I can't explain the rest of the clue.

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(Other definitions for utterly that I've seen before include "Completly and without qualification" , "Absolutely and completely" , "Completely and totally" , "Downright" , "'All is changed, changed . . .' (Yeats)" .)

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