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.
Birdsell intends to keep the listing — with Denise Taylor of Green Tree Real Estate — up for six months before taking it down for listing at a later, undefined date. Katie Wiseman, IndyStar, 18 July 2025 Perez Hilton, among others, suggested Hewitt and Gellar were still engaged in an undefined, decadeslong feud after Gellar dodged questions about Hewitt on a red carpet and excluded her from an Instagram Story about the film. Rachel Handler, Vulture, 18 July 2025 But many are navigating silent hesitation, especially when the role feels undefined or the stakes feel higher than what they’re used to. Keith D. Dorsey, Forbes.com, 15 July 2025 The sense of evil has nothing cosmic or metaphysical about it; there’s no grandeur and no wonder to Gunn’s universe and, although there’s much discussion of the defining quality of one’s actions and choices, the film’s superheroes seem thin, constrained, and undefined. Richard Brody, New Yorker, 10 July 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

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Cite this Entry

“Undefined.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/undefined. Accessed 29 Jul. 2025.

Last Updated: - Updated example sentences
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