undefined

adjective

un·​de·​fined ˌən-di-ˈfīnd 

: 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

Synonyms

• vague
• faint

Examples of undefined in a Sentence

plagued by undefined worries that kept her awake at night

Recent Examples on the Web

Finally, an undefined robot voice affirms that the differences between Camilo and his lover are clear, and might cause issues in the long run. —Andrea Flores, Los Angeles Times, 26 June 2025

At the start of the film, Laura, played by Paula Beer, is experiencing an undefined mental crisis but reluctantly agrees to go on a car journey with her boyfriend. —Leo Barraclough, Variety, 17 May 2025

And trust drives engagement, growth and influence far more effectively than trying to please a broad, undefined audience. —Conrad Young, Forbes.com, 5 June 2025

Even though the offer was undefined, Adams was intrigued. —Matthew Fairburn, New York Times, 2 June 2025

Word History

First Known Use

1611, in the meaning defined above

Rhymes for undefined

• aligned
• alined
• assigned
• behind
• combined
• confined
• consigned
• declined
• defined
• designed
• divined
• enshrined