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

Like other big tech names, Oracle is betting much of its future on the promise that demand for computing capacity will keep going up as generative AI ushers in some kind of as-yet-undefined revolution. —Allison Morrow, CNN Money, 11 Sep. 2025

But with many terms still undefined, small business owners must be nimble—leveraging digital tools, planning for financial flexibility, and preparing for multiple scenarios to stay ahead. —Eric Youngstrom, Forbes.com, 8 Sep. 2025

When time off is undefined, the good ones don’t take PTO. —Preston Fore, Fortune, 23 Aug. 2025

The younger Bayh is largely undefined. —Hayleigh Colombo, IndyStar, 19 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