Truly dreadful (9)

I believe the answer is:

appalling

'truly dreadful' is the definition.

This is all the clue.

(Other definitions for appalling that I've seen before include "page entirely covered in copying" , "Absolutely horrifying" , "Greatly horrifying" , "Dreadful" , "Shocking, outrageous" .)

I've seen this clue in The Guardian.

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