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

This mindset defers well-being to an undefined future, perpetuating a cycle of overwork and dissatisfaction. —Amy Blankson, Forbes, 22 Jan. 2025

And Trump has appointed Richard Grenell, his former ambassador to Germany, whose name was floated as a potential secretary of State, for the undefined role of presidential envoy for special missions. —Laura Kelly, The Hill, 20 Jan. 2025

Part of the appeal, and the intimidation factor, of spreadsheets is their undefined scope. —Mikayla Whitmore, New York Times, 20 Jan. 2025

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

Word History

First Known Use

1611, in the meaning defined above