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

Spring/summer 2025 collections from undefined 3.1 Philip Lim, Luar, Willy Chavarria and more will be showcased during the more than 60 runway shows scheduled for the beginning of September. —Kimi Robinson, USA TODAY, 1 Sep. 2024

Vance’s exact portfolio in the incoming administration is still undefined. —Brett Samuels, The Hill, 20 Dec. 2024

Many arguments or discussions are often shut down simply because they’re considered unkind, judgy, or not in the undefined spirit of BookTok. —Ct Jones, Rolling Stone, 18 Dec. 2024

First streamers, and now anyone addressing an undefined audience. —Kate Lindsay, Vulture, 5 Dec. 2024

Word History

First Known Use

1611, in the meaning defined above