unpredictable

[uhn-pri-dik-tuh-buhl]
adjective
1.
not predictable; not to be foreseen or foretold: an unpredictable occurrence.
noun
2.
something that is unpredictable: the unpredictables of life.

Origin:
1855–60; un-1 + predictable

unpredictability, unpredictableness, noun
unpredictably, adverb


1. erratic, fitful, variable, uncertain.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unpredictable (ˌʌnprɪˈdɪktəbəl)
 
adj
not capable of being predicted; changeable
 
unpredicta'bility
 
n
 
unpre'dictableness
 
n
 
unpre'dictably
 
adv

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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Etymonline
Word Origin & History

unpredictable
1857, from un- (1) "not" + predictable (see predict).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Blustery, unpredictable fall weather calls for a transition coat, something
  between an overcoat and a raincoat.
There will be spectrum frequency conflict and unpredictable side effects.
As demand for freshwater soars, planetary supplies are becoming unpredictable.
Many of the nation's leading seismologists now think that earthquakes are
  inherently unpredictable.
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