unexpected

[uhn-ik-spek-tid]
adjective
not expected; unforeseen; surprising: an unexpected pleasure; an unexpected development.

Origin:
1580–90; un-1 + expect + -ed2

unexpectedly, adverb
unexpectedness, noun


unanticipated. See sudden.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unexpected (ˌʌnɪkˈspɛktɪd)
 
adj
surprising or unforeseen
 
unex'pectedly
 
adv
 
unex'pectedness
 
n

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

unexpected
c.1586, from un- (1) "not" + pp. of expect.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
And some take existing technology and give it an unexpected twist for a
  surprising result.
While at first this may be surprising, it is really not unexpected.
The unexpected improvement in the fiscal picture was a result of rising incomes.
The effort, however, has met with unexpected complications.
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