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.
Mortgages in a buyer-friendly market Those with undefined immigration status who bought property a few years ago now have significant equity in their homes and are selling quickly to take advantage of that, Rojas said. Sarah Moreno july 14, Miami Herald, 14 July 2025 With more destinations around the world pushing back against overtourism and the potential for geopolitical impacts on itineraries, private islands can offer a more undefined, convenient alternative, according to Marilyn Macallair, a cruise travel analyst for Phocuswright. Nathan Diller, USA Today, 4 July 2025 When time off is undefined, the good ones don’t take PTO. Preston Fore, Fortune, 2 July 2025 But so far, no other E.U. country has publicly volunteered to serve in such a force, which is largely undefined and unfinanced, and which Russia has consistently rejected. Steven Erlanger, New York Times, 26 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 18 Jul. 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!