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

Unlike other startups that are chasing the still relatively undefined goal of achieving AGI (an AI system that rivals human intelligence), Cohere is focused on how AI can best be used to increase productivity, Cohere cofounder Nick Frosst told me last week. —Rashi Shrivastava, Forbes.com, 19 Aug. 2025

Many have compared Gladys to a classic fairy tale antagonist, a villain whose undefined age and unambiguously evil motivations thrust a town into chaos. —Brian Welk, IndieWire, 12 Aug. 2025

Greenstein is currently in talks to join Paramount-Skydance in an undefined senior executive role. —Anthony D'alessandro, Deadline, 28 July 2025

Over seven hallucinatory days, a village with no name, in an undefined time and place, disappears. —Jill Goldsmith, Deadline, 1 Aug. 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