Amazed, stunned (9)
I believe the answer is:
astounded
I believe this clue is a double definition.
'amazed' is the first definition.
(synonyms)
'stunned' is the second definition.
(synonyms)
(Other definitions for astounded that I've seen before include "Bewildered" , "Gobsmacked w" , "disconcerted" , "Greatly surprised" , "Sound date changed and astonished" .)