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.
Rural hospitals must maintain broad clinical coverage despite limited staffing, rising supply costs, an unpredictable payer mix, and an aging, sicker population. David Chou, Forbes.com, 22 Jan. 2026 Like other extraction shooters, such as ARC Raiders, Marathon will mix both PvE (co-op gameplay) and PvP (player-versus-player) action, making each trip down to Tau Ceti IV unpredictable and filled with danger. Fran Ruiz, Space.com, 21 Jan. 2026 The pleasure, as with the unpredictable FX not-quite-anthologies Atlanta and Reservation Dogs, is in never knowing what each compact episode will bring. Judy Berman, Time, 21 Jan. 2026 Most in the department, though, recognise the value of Starmer maintaining a close relationship with someone who, while extraordinarily unpredictable, will at least pick up the phone and speak to him. Ian King, CNBC, 21 Jan. 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 23 Jan. 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

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!