verb (used with object)
to overwhelm with amazement; astonish greatly; shock with wonder or surprise.
Archaic. astonished; astounded.

1275–1325; Middle English astoun(e)d, past participle of astonen, variant of astonyen to astonish

astoundment, noun

1. See surprise. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
astound (əˈstaʊnd)
(tr) to overwhelm with amazement and wonder; bewilder
[C17: from astoned amazed, from Old French estoné, from estoner to astonish]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1600, from M.E. astouned, astoned (c.1300), pp. of astonien "to stun" (see astonish), with more of the original sense of V.L. *extonare.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Still, the power of decentralised collaboration astounded everyone.
Even they were astounded at how well it seemed to work.
To see you even after you were viciously attacked with a smile on your face
  astounded me.
They are astounded at the amount of stuff coming out of their noses all day.
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