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Definition of unpredictable - 3 dictionary results

un⋅pre⋅dict⋅a⋅ble

  [uhn-pri-dik-tuh-buhl]
Use unpredictable in a Sentence
–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

Related forms:
un⋅pre⋅dict⋅a⋅bil⋅i⋅ty, un⋅pre⋅dict⋅a⋅ble⋅ness, noun
un⋅pre⋅dict⋅a⋅bly, adverb

Synonyms:
1. erratic, fitful, variable, uncertain.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To unpredictable
un·pre·dict·a·ble   (ŭn'prĭ-dĭk'tə-bəl)   
adj.  Difficult to foretell or foresee: unpredictable test results; unpredictable behavior.
n.  Something difficult or impossible to foretell or foresee.
un'pre·dict'a·bil'i·ty n., un'pre·dict'a·bly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

unpredictable 
1857, from un- (1) "not" + predictable (see predict).
Online Etymology Dictionary, © 2001 Douglas Harper
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