Crossword Genius

Incredibly appallingly (10)

Ross

I believe the answer is:

dreadfully

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This clue could be a double definition.

'incredibly' is the first definition.
Both the answer and definition are adverbs. Perhaps they are linked in a way I don't understand?

'appallingly' is the second definition.
(thesaurus)

Can you help me to learn more?

(Another definition for dreadfully that I've seen is " Far from well".)

I've seen this clue in The Everyman puzzle in The Observer.
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