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.
In doing so, lawmakers in the GOP will be forced to fully own the unpredictable consequences of the widening conflict. Zachary Schermele, USA Today, 5 Mar. 2026 Classic nickname That towering stature along with Myers’ flashy, sometimes unpredictable play style earned him one of the best nicknames in hockey during his seven seasons in Vancouver. Sportsday Staff, Dallas Morning News, 5 Mar. 2026 Jim O’Connor, ValenSil’s buyer and hiring manager, attributed the production drop-off to the steep tariffs on inputs like aluminum and the heavily unpredictable nature of how they’ve been implemented. Alicia Wallace, CNN Money, 5 Mar. 2026 According to Food Allergy Research & Education, allergic reactions to soy are typically mild and produce symptoms such as hives, stomach cramps, nausea, vomiting, diarrhea, and itching, but reactions can be unpredictable. Michele Laufik, Martha Stewart, 4 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 9 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

More from Merriam-Webster on unpredictable

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