If you are astounded by something, you are very shocked or surprised that it could exist or happen. I was astounded by its beauty I am astounded at the comments made by the Chief Superintendent. = astonished. very surprised or shocked = astonished astounded by/at
filled with the emotional impact of overwhelming surprise or shock; "an amazed audience gave the magician a standing ovation"; "I stood enthralled, astonished by the vastness and majesty of the cathedral"; "astounded viewers wept at the pictures from the Oklahoma City bombing"; "stood in stunned silence"; "stunned scientists found not one but at least three viruses"