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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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
Pics of the the worlds beyond ours never cease to amaze and astound me.
The point is that style trends, not unlike political ones, still have the power
  to astound.
Great and fancy libraries astound us, but it's the personal library where a
  scholar's serious work begins.
The variety and power of the human mind never fails to astound me.
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