causing astonishment or surprise; amazing: an astonishing victory; an astonishing remark.

1520–30; astonish + -ing2

astonishingly, adverb
astonishingness, noun Unabridged


verb (used with object)
to fill with sudden and overpowering surprise or wonder; amaze: Her easy humor and keen intellect astonished me.

1525–35; Middle English astonyen, astonen, probably < dialectal Old French *astoner, Old French estoner < Vulgar Latin *extonāre, for Latin attonāre to strike with lightning, equivalent to ex- ex-1, at- at- + tonāre to thunder; extended by -ish2, perhaps reflecting Anglo-French *astonir < dialectal Old French

astonishedly, adverb
astonisher, noun
superastonish, verb
unastonished, adjective

astound, startle, shock. See surprise. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
astonish (əˈstɒnɪʃ)
(tr) to fill with amazement; surprise greatly
[C15: from earlier astonyen (see astonied), from Old French estoner, from Vulgar Latin extonāre (unattested) to strike with thunder, from Latin tonāre to thunder]

astonishing (əˈstɒnɪʃɪŋ)
causing great surprise or amazement; astounding

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

mid-14c., astonien, from O.Fr. estoner "to stun, daze, deafen, astound," from V.L. *extonare, from L. ex- "out" + tonare "to thunder" (see thunder); so, lit. "to leave someone thunderstruck." The modern form (influenced by English verbs in -ish, e.g. distinguish, diminish)
is attested from c.1530. Related: Astonishment.
"No wonder is thogh that she were astoned" [Chaucer, "Clerk's Tale"]
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Students can gain easy online access to an astonishing array of ready-made term
  papers, and for a fee, they can get.
Well, you can find that astonishing and stupendous principle in any basic
  micro-economic undergraduate elementary textbook.
Among mammals alone, the number of nocturnal species is astonishing.
In general, the more barren the desert is, the more rare and astonishing the
  flower show will be.
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