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.
Fetterman, by contrast, has built a reputation as an unpredictable but transactional-free vote, one guided more by instinct than negotiation. Ramsey Touchberry, The Washington Examiner, 26 Mar. 2026 Airport conditions have become increasingly unpredictable with swelling crowds seen in major hubs. Arkansas Online, 25 Mar. 2026 The most destabilizing aspect of the music is neither the force of Simo Cell’s drums nor the slipperiness of Miniawy’s vocals, but the unpredictable way that their songs are structured. Philip Sherburne, Pitchfork, 25 Mar. 2026 Barbu’s experience is a raw reminder of how unpredictable ultra-distance racing can be, even for an athlete who has already survived jungles, deserts and Arctic ice in a single year of competition. Samantha Agate, Miami Herald, 25 Mar. 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 29 Mar. 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

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