mind-boggling (10)
'mind-boggling' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for astonishing that I've seen before include "Mind-boggling" , "Amazing" , "impressive" , "Greatly surprising" .)
'mind-boggling' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for astounding that I've seen before include "Stunning" , "Extraordinary" , "Amazing" .)