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unpredictable

[uhn-pri-dik-tuh-buh l] /ˌʌn prɪˈdɪk tə bəl/
adjective
1.
not predictable; not to be foreseen or foretold:
an unpredictable occurrence.
noun
2.
something that is unpredictable:
the unpredictables of life.
Origin of unpredictable
1855-1860
1855-60; un-1 + predictable
Related forms
unpredictability, unpredictableness, noun
unpredictably, adverb
Synonyms
1. erratic, fitful, variable, uncertain.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for unpredictable
Contemporary Examples
Historical Examples
  • That hadn't been malice, only sensible precaution against the unpredictable.

    Stamped Caution Raymond Zinke Gallun
  • Often its leaps and flickerings are irregular, inconsistent, unpredictable.

    Cleo The Magnificent Louis Zangwill
  • Some changes are unpredictable, even in deterministic principle.

    After the Rain Sam Vaknin
  • Blessed if you're not as unpredictable as one of Hitler's speeches.

    Dave Dawson at Truk Robert Sydney Bowen
  • The planet, though, was of no use to humanity because it was unpredictable.

    Talents, Incorporated William Fitzgerald Jenkins
British Dictionary definitions for unpredictable

unpredictable

/ˌʌnprɪˈdɪktəbəl/
adjective
1.
not capable of being predicted; changeable
Derived Forms
unpredictability, unpredictableness, noun
unpredictably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for unpredictable
adj.

1857, from un- (1) "not" + predictable. Related: Unpredictably; unpredictability.

Online Etymology Dictionary, © 2010 Douglas Harper
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