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

• blear
• bleary
• blurry
• dim
• faint
• foggy
• fuzzy
• gauzy
• hazy
• indefinite
• indistinct
• indistinguishable
• misty
• murky
• nebulous
• obscure
• opaque
• pale
• shadowy
• unclear
• undetermined
• vague

Examples of undefined in a Sentence

plagued by undefined worries that kept her awake at night

Recent Examples on the Web

The Trump administration tabled a draft peace accord, but the terms — including U.S. recognition of Crimea as Russian territory, a freeze of the front lines and undefined security guarantees for Ukraine — have managed to do nothing but upset everyone. —Daniel Depetris, Chicago Tribune, 29 Apr. 2025

Here’s a look at the progression between the two: Upon inspection, the bare branches of the trees look fuzzy and pixelated, while the steps in the snow appear undefined. —PCMAG, 14 Mar. 2025

The paper proceeds to paste together a transhistorical collage of names (Aristotle, Carl Linnaeus, Giovanni Morelli, Giorgio Vasari) in the service of the idea that partnership between the arts and science (both undefined) has an illustrious genealogy. —Sonja Drimmer, Artforum, 1 Apr. 2025

The season 21 lead — who attended the gala with her former Dancing with the Stars partner Sasha Farber amid their undefined relationship — previously told PEOPLE her thoughts about the dating show’s hiatus. —Brian Anthony Hernandez, People.com, 31 Mar. 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