astonishing · adjective /əˈstɑn.ɪʃ.ɪŋ/
astonishing
B2 very surprising
Dictionary examples:
Her first novel enjoyed an astonishing level of success.
It's astonishing to think that only a few years ago Communism dominated eastern Europe.
Learner example:
The Lakeside Inn, is not an expensive one, at all, it has got a good restaurant, nice service and an astonishing view of Lake Frene. (First Certificate in English; B2; Portuguese)