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.
That creates unpredictable jumps in the signal timing estimates that the researchers rely upon to calculate positioning data. Andrew Cunningham, ArsTechnica, 11 May 2026 Provencio notes that practical survival items matter most during an evacuation, especially when conditions become unpredictable. Lauren Jarvis-Gibson, Charlotte Observer, 11 May 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, 11 May 2026 For many people living with hidradenitis suppurativa (HS), flares can feel sudden and unpredictable—appearing without warning and, often, without a clear reason why. Lauryn Higgins, Flow Space, 11 May 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 14 May. 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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