Astounding, awe-inspiring (7)
I believe the answer is:
amazing
I believe this is a double definition.
'astounding' is the first definition.
('amaze' can be a synonym of 'astound')
'awe-inspiring' is the second definition.
(synonyms)
(Other definitions for amazing that I've seen before include "description of Grace?" , "Astounding, awe-inspiring" , "Very impressive" , "Awesome, astounding" , "Excellent; surprising" .)