As nouns the difference between astonishment and astoundedness
is that astonishment
is amazement, great surprise while astoundedness
is (rare) the state of being astounded; astonishment.
amazement, great surprise
An amazing thing or phenomenon.
- Everything he had seen so far--the great chocolate river, the waterfall, the huge sucking pipes, the candy meadows, the Oompa-Loompas, the beautiful pink boat, and most of all, Mr. Willy Wonka himself--had been so astonishing that he began to wonder whether there could possibly be anymore astonishments left.
(rare) The state of being astounded; astonishment.