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

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

Keep scrolling for more

Other Words from unpredictable

unpredictably \ ˌən-​pri-​ˈdik-​tə-​blē \ adverb
changes that occur unpredictably
unpredictability \ ˌən-​pri-​ˌdik-​tə-​ˈbi-​lə-​tē \ noun
the unpredictability of the weather

Examples of unpredictable in a Sentence

Recent Examples on the Web

By its very nature, KeyForge is an unpredictable experience. Charlie Theel, Ars Technica, "KeyForge: The red-hot card game where every deck is unique—and unchangeable," 15 Dec. 2018 Everyone is going to lose bone mass and muscle mass, but the amount of unpredictable. Alyson Krueger, Condé Nast Traveler, "Will Non-Astronauts Survive Space Travel? Q&A with a NASA Researcher," 3 Oct. 2018 For decades, Rwandans have been leery of dogs, even viewing them as dangerous, partly because of their role as aggressive security animals and reputation as rabid, unpredictable strays. Yana Paskova, National Geographic, "Learning to Love Dogs in Kigali," 29 June 2018 But Amazon’s new, three-part series A Very English Scandal tells the absolutely true story of Jeremy Thorpe, an ambitious and closeted British politician in the 1970s who attempted to orchestrate the murder of an unpredictable ex-lover. Michele Corriston, PEOPLE.com, "Hugh Grant Returns to TV as a Gay Politician Who Attempts Murder in A Very English Scandal," 29 June 2018 Though the Democrats running for the seat insist the district is safely blue, Flores presents a formidable challenge in an unpredictable special election. Jasper Scherer, San Antonio Express-News, "Crowded races shapes up for Carlos Uresti’s Senate seat," 26 June 2018 But the president’s own, predictably unpredictable routine is unlikely to work much better. Benjamin Hart, Daily Intelligencer, "Trump’s Reality Distortion Field Could be a Huge Asset for Democrats This Fall," 28 Apr. 2018 To that end, the forthcoming playoffs are on track to be as unpredictable as any in recent memory because, well, the Rockets’ rivals are on the mend. Sam Amick, USA TODAY, "Houston Rockets closing in on No. 1 seed, remain unfazed about who's behind them," 22 Mar. 2018 The truth is, the weather can be super unpredictable—but finding the right gear doesn’t have to be a guessing game. Amy Marturana, SELF, "The 20 Best New Running, Hiking, and Swimming Accessories and Apparel," 12 Nov. 2018

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.

See More

First Known Use of unpredictable

1840, in the meaning defined above

Keep scrolling for more

Learn More about unpredictable

Share unpredictable

Statistics for unpredictable

Last Updated

18 Jan 2019

Look-up Popularity

Time Traveler for unpredictable

The first known use of unpredictable was in 1840

See more words from the same year

Keep scrolling for more

More Definitions for unpredictable


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

Keep scrolling for more

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).


important, real, or meaningful

Get Word of the Day daily email!

Test Your Vocabulary

Homophone Quiz

  • three-bears-two-of-them-look-like-theyre-whispering-to-a-third-bear-who-looks-chuffed-to-be-the-center-of-attention
  • In order to judge how people felt, the senator's office hired a firm to take a ______.
Spell It

Can you spell these 10 commonly misspelled words?

Add Diction

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!