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unpredictable

[uhn-pri-dik-tuh-buhl]
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 for unpredictable

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for unpredictably

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 unpredictably

unpredictable

adj.

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

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Online Etymology Dictionary, © 2010 Douglas Harper