verb (used with object), stunned, stunning.
to deprive of consciousness or strength by or as if by a blow, fall, etc.: The blow to his jaw stunned him for a moment.
to astonish; astound; amaze: Her wit stunned the audience.
to shock; overwhelm: The world was stunned by the attempted assassination.
to daze or bewilder by noise.
the act of stunning.
the condition of being stunned.

1250–1300; Middle English stonen, stunen (v.) < Old French estoner to shake, make resound; see astonish

unstunned, adjective

2, 3. See shock1. 4. stupefy. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stun (stʌn)
vb , stuns, stunning, stunned
1.  to render unconscious, as by a heavy blow or fall
2.  to shock or overwhelm
3.  to surprise or astound
4.  the state or effect of being stunned
[C13 stunen, from Old French estoner to daze, stupefy, from Vulgar Latin extonāre (unattested), from Latin ex-1 + tonāre to thunder]

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.1300, "to daze or render unconscious" (from a blow, powerful emotion, etc.), probably aphetic of O.Fr. estoner "to stun" (see astonish). Stunning popularized for "splendid, excellent" c.1849.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Film footage showed the huge, deep-sea squid use its glowing arms to blind and
  stun its prey.
They swat or bat their bills from side to side in order to stun their prey,
  feeding on the fish until they're all gone.
Jellyfish have tiny stinging cells in their tentacles to stun or paralyze their
  prey before they eat them.
These crustaceans can close their giant claws so violently that they snap shut
  with a deafening sound used to stun prey.
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