undefined

adjective

un·​de·​fined ˌən-di-ˈfīnd How to pronounce undefined (audio)
: not defined: such as
a
: not clearly or precisely shown, described, or limited
undefined rules
undefined powers
a vague, undefined feeling of dread
… the true outlines of Clinton's foreign policy remain undefined.William Greider
b
: not provided with a definition
an undefined dictionary entry

Examples of undefined in a Sentence

plagued by undefined worries that kept her awake at night
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.
The aspirational numbers are dazzling but many details are undefined, with much left to be decided down the road in a world fraught with geopolitical and economic impediments. David Blackmon, Forbes.com, 18 May 2025 Its purpose is no longer unclear or undefined; the industry recognizes it as a solid platform for experienced directors whose films do well in theaters. Elsa Keslassy, Variety, 17 May 2025 Smotrich's comments come just a day after Israeli Prime Minister Benjamin Netanyahu's government approved a plan to take over Gaza and hold it for an undefined period on Monday. Anders Hagstrom, FOXNews.com, 6 May 2025 The Trump administration tabled a draft peace accord, but the terms — including U.S. recognition of Crimea as Russian territory, a freeze of the front lines and undefined security guarantees for Ukraine — have managed to do nothing but upset everyone. Daniel Depetris, Chicago Tribune, 29 Apr. 2025 See All Example Sentences for undefined

Word History

First Known Use

1611, in the meaning defined above

Time Traveler
The first known use of undefined was in 1611

Browse Nearby Words

Cite this Entry

“Undefined.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/undefined. Accessed 2 Jun. 2025.

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!