unpredictable

adjective

un·​pre·​dict·​able ˌən-pri-ˈdik-tə-bəl How to pronounce unpredictable (audio)
: 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.
Enjoy the unpredictable and the unknown, which is where wonder and curiosity and adventure unfold. Kathleen Wong, USA Today, 20 Aug. 2025 While some travelers visit family or business contacts, U.S. officials warn that conditions remain unpredictable and dangerous. Gabe Whisnant, MSNBC Newsweek, 19 Aug. 2025 But humanitarian logistics operates in far more volatile and unpredictable environments. Cynthia Tully, Forbes.com, 19 Aug. 2025 When two central defenders perform as well as William Saliba and Gabriel did against a tricky and unpredictable new-look United forward line, the compliments usually rain down. Oliver Kay, New York Times, 18 Aug. 2025 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 4 Sep. 2025.

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

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!