un·​pre·​dict·​able | \ ˌən-pri-ˈdik-tə-bəl How to pronounce unpredictable (audio) \

Definition of unpredictable

: not predictable: such as
a : not able to be known or declared in advance unpredictable weather
b : tending to behave in ways that cannot be predicted an unpredictable boss

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Other Words from unpredictable

unpredictably \ ˌən-​pri-​ˈdik-​tə-​blē How to pronounce unpredictably (audio) \ adverb
changes that occur unpredictably
unpredictability \ ˌən-​pri-​ˌdik-​tə-​ˈbi-​lə-​tē How to pronounce unpredictability (audio) \ noun
the unpredictability of the weather

Examples of unpredictable in a Sentence

Recent Examples on the Web

But past accomplishments mean very little in a tournament that is currently so unpredictable. Luis Miguel Echegaray, SI.com, "History, Rivalry Front and Center in Both Copa America Semifinals," 1 July 2019 Just as traffic and weather are unpredictable when traveling, so is the snack selection. Samantha Cassetty, NBC News, "The best healthy travel snacks, according to nutritionists and dietitians," 26 June 2019 Because migraines are so unpredictable, migraine sufferers often worry when one is going to strike. Cory Stieg, refinery29.com, "Khloé Kardashian Got Migraines Following Cheating Scandal," 25 June 2019 Has weather in recent years become more unpredictable? Karen Zurawski, Houston Chronicle, "SUNDAY CONVERSATION: Lightning sparks Jim Siebert’s interest in weather," 23 June 2019 In eastern Congo, by contrast, the outbreak careered out of control because the area is so lethally unpredictable. New York Times, "For the Third Time, W.H.O. Declines to Declare the Ebola Outbreak an Emergency," 14 June 2019 My schedule is based on what my donors need and want to do, so life is fully unpredictable. San Diego Union-Tribune, "From student cold-caller to foundation president, a career dedicated to philanthropy," 8 June 2019 The timing of these jumps is entirely unpredictable. Chris Lee, Ars Technica, "Following Schrödinger’s cat to its death and giving it a reprieve," 5 June 2019 Then there’s chaotic synchronization, where oscillators that are individually unpredictable nonetheless sync up and evolve together. Quanta Magazine, "Scientists Discover Exotic New Patterns of Synchronization," 4 Apr. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'unpredictable.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of unpredictable

1840, in the meaning defined above

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Statistics for unpredictable

Last Updated

5 Jul 2019

Look-up Popularity

Time Traveler for unpredictable

The first known use of unpredictable was in 1840

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More Definitions for unpredictable



English Language Learners Definition of unpredictable

: not capable of being known before happening or being done
: not always behaving in a way that is expected


un·​pre·​dict·​able | \ ˌən-pri-ˈdik-tə-bəl\

Kids Definition of unpredictable

: impossible to predict The king was a completely unpredictable tyrant.— Brian Jacques, Redwall

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Comments on unpredictable

What made you want to look up unpredictable? Please tell us where you read or heard it (including the quote, if possible).


to form ideas or theories about something

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