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.
Prices are subject to rapid, unpredictable changes due to factors like, but not limited to, supply/demand, weather, and geopolitical events. Usa Today, USA Today, 2 Apr. 2026 Even during a recess when most members are not in Washington, this could be unpredictable, especially in the House, where many hard-line conservatives oppose a deal that does not fully fund DHS. Sam Gringlas, NPR, 1 Apr. 2026 Vehicles are incredibly dangerous to be inside if you're hit with a tornado, and storms can move in unpredictable ways. Dale Denwalt, Oklahoman, 1 Apr. 2026 Air travelers are paying the price of the shutdown with unpredictable, snaking TSA lines at airports across the country, jeopardizing their chances to pass through security on time for their flights. Graham Hurley, CNN Money, 31 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 3 Apr. 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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