unawares

[uhn-uh-wairz]
adverb
1.
while not aware or conscious of a thing oneself; unknowingly or inadvertently.
2.
without warning; by surprise; suddenly; unexpectedly: to come upon someone unawares.

Origin:
1525–35; unaware + -s1

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World English Dictionary
unawares (ˌʌnəˈwɛəz)
 
adv
1.  without prior warning or plan; unexpectedly: she caught him unawares
2.  without being aware of or knowing: he lost it unawares

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

unawares
1530s, "without being aware," from un- (1) "not" + aware + adverbial genitive -s. Meaning "without being noticed" is recorded from 1660s. Form unaware is recorded from 1590s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Better to let the student go about his life unawares, as if his verbal fly were
  open.
On world markets, buyers have also been caught unawares.
Immediate donning eliminates the chance for a miner entering an irrespirable
  atmosphere unawares.
Taken unawares, with out leaders and with little food, the mutineers
  surrendered.
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