unpredictable

adjective

un·​pre·​dict·​able ˌən-pri-ˈdik-tə-bəl How to pronounce unpredictable (audio)
Synonyms of unpredictablenext
: 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
unpredictably adverb
changes that occur unpredictably
unpredictability noun
the unpredictability of the weather

Examples of unpredictable in a Sentence

unpredictable spring weather that makes it really hard to know what to wear
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The Sierra Avalanche Center said the threat of more avalanches remained Wednesday and the snowpack was unstable and unpredictable in an area known for steep, craggy cliffs. Arkansas Online, 19 Feb. 2026 The findings suggest that data-rich industries with repetitive tasks are standing on a precipice, while those requiring human empathy or manual dexterity in unpredictable environments remain safe—for now. Nick Lichtenberg, Fortune, 18 Feb. 2026 For women in perimenopause and menopause, when hormones feel unpredictable and symptoms can be frustrating (er, infuriating) and vague, having a tool that makes at least one piece of the internal puzzle visible can be empowering. Rita Templeton, Flow Space, 18 Feb. 2026 The four principals’ unmet personal and professional needs play out in unpredictable, funny and warm — as well as shattering — ways. Los Angeles Times, 18 Feb. 2026 See All Example Sentences for unpredictable

Word History

First Known Use

1840, in the meaning defined above

Time Traveler
The first known use of unpredictable was in 1840

Browse Nearby Words

Cite this Entry

“Unpredictable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unpredictable. Accessed 22 Feb. 2026.

Kids Definition

unpredictable

adjective
un·​pre·​dict·​able
ˌən-pri-ˈdik-tə-bəl
: not predictable
unpredictability
-ˌdik-tə-ˈbil-ət-ē
noun
unpredictably
-ˈdik-tə-blē
adverb

More from Merriam-Webster on unpredictable

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