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

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

Internal dynamics are mostly undefined; individual personalities are thinly sketched at best. —Alison Herman, Variety, 28 May 2025

This is a sweeping, undefined provision that could rule out any changes to local growth guidelines in Florida unless developers agree and sponsor the change. —Paul Owens, The Orlando Sentinel, 16 May 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