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.
And, of course, pay is unpredictable, relying on both demand and customer tips. Kathy Kristof, San Diego Union-Tribune, 27 Apr. 2026 This makes the results more relevant for real-world operations, where AUVs are used to map the seabed, inspect infrastructure, and navigate unpredictable underwater environments. Georgina Jedikovska, Interesting Engineering, 27 Apr. 2026 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, 27 Apr. 2026 Perhaps nowhere in the Pacific are there rip currents as strong or unpredictable as the ones underlying the Ducks’ first-round series with the Edmonton Oilers. Andrew Knoll, Oc Register, 27 Apr. 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 28 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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