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 talking stage seems to be a paradoxical, almost liminal space: both liberating and frustrating, full of potential yet undefined. Mark Travers, Forbes.com, 28 Mar. 2025 Timothy Bechtel, a senior professor of geosciences at undefined in Lancaster, Pennsylvania, told the Bergen Record that most sinkholes are caused by precipitation and begin with a manmade void or a natural cave. Saleen Martin, USA TODAY, 21 Mar. 2025 The undefined goals of the tit-for-tat escalation with some of the United States’ most important partners has left markets reeling and businesses baffled as to how this ends. Philip Elliott, TIME, 5 Mar. 2025 What To Know Reuters, Bloomberg and CNN were among news outlets which reported that Trump had ordered the suspension of all military aid supplies to Kyiv pending an undefined Ukrainian commitment to a peaceful settlement of the war. Thomas G. Moukawsher, Newsweek, 4 Mar. 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 3 Apr. 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!