IPA: /əˈstɒnɪʃmənt/
KK: /əˈstɑnɪʃmənt/
A feeling of great surprise or wonder about something unexpected.
She looked at the magician in astonishment as he performed his tricks.
Astonishment → It is formed from "astonish" (from Old French *estoner*, meaning to stun or shock) and "-ment" (a suffix used to form nouns indicating an action or resulting state). The word "astonishment" refers to the state of being stunned or shocked by something unexpected.
Think of being 'stunned' ('astonish') and the '-ment' indicating a state — that's why astonishment means the state of being shocked.