astounded by/at• His teacher at the private school was astounded by his quick mind.• Bill was astounded at how many there were.• All of us would be astounded by open rejections that stated: No Blacks.• Her friend, Jean, was still astounded by the black legs of lamb.• The humans were astounded by the grace and majesty of Elf civilisation and well-pleased with the commerce that went on there.• Merola closed his eyes and listened, astounded by the stadium's amazingacoustics.• She was astounded by the understanding in his tone.• Dooley was so astounded at this extraordinary thought, he was unable to speak.