Crossword Genius

Extremely, but not unspeakably? (7)

Ross

I believe the answer is:

utterly

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'extremely' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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

I've seen this clue in the Evening Standard.
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