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unpredictable

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

First recorded in 1855–60; un-1 + predictable
Related formsun·pre·dict·a·bil·i·ty, un·pre·dict·a·ble·ness, nounun·pre·dict·a·bly, adverb

Synonyms

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1. erratic, fitful, variable, uncertain.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for unpredictable

Contemporary Examples

Historical Examples

  • Often its leaps and flickerings are irregular, inconsistent, unpredictable.

    Cleo The Magnificent

    Louis Zangwill

  • In E science the unpredictable, the incredible, the illogical could happen at any time.

    Eight Keys to Eden

    Mark Irvin Clifton

  • The planet, though, was of no use to humanity because it was unpredictable.

    Talents, Incorporated

    William Fitzgerald Jenkins

  • Some changes are unpredictable, even in deterministic principle.

    After the Rain

    Sam Vaknin

  • It is that which is by its nature irregular and unpredictable.

    Aristotle

    George Grote


British Dictionary definitions for unpredictable

unpredictable

adjective
  1. not capable of being predicted; changeable
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Derived Formsunpredictability or unpredictableness, noununpredictably, 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

Word Origin and History for unpredictable

adj.

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

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Online Etymology Dictionary, © 2010 Douglas Harper