astonishment · noun U /əˈstɒn.ɪʃ.mənt/
astonishment
B2 very great surprise
Dictionary examples:
To my astonishment, she started laughing.
She gasped in astonishment.
Learner example:
To our astonishment, we were in front of a small house which seemed to have been built centuries ago. (First Certificate in English; B2; Greek)