unidentified

adjective

un·​iden·​ti·​fied ˌən-ī-ˈden-tə-ˌfīd 

-ə-ˈden-

: not having a known or established identity : not identified

unidentified flying objects

an unidentified suspect

Synonyms of unidentified

• one
• unnamed

Examples of unidentified in a Sentence

an unidentified worker reported the security breach

some unidentified person helped them and then left quietly

Recent Examples on the Web

In the company’s new subscription product, there is no flurry of random off-topic comments posted by unidentified users. — Brian Steinberg, Variety, 10 Sep. 2026

The unidentified driver, who was the sole occupant of the GMC, was taken to a nearby hospital with serious injuries, DPS said. — Shambhavi Rimal, Fort Worth Star-Telegram, 9 Sep. 2026

The unidentified juvenile was bitten while swimming in the preserve, and deputies said the victim and several other juveniles became stranded on a sandbar. — Steven Yablonski, CBS News, 9 Sep. 2026

Americares, a nonprofit that supports thousands of health centers globally, announced a $50-million gift Wednesday from an unidentified Connecticut family. — James Pollard, Los Angeles Times, 9 Sep. 2026

Word History

First Known Use

1861, in the meaning defined above

Phrases Containing unidentified

• unidentified aerial phenomenon
• unidentified anomalous phenomenon
• unidentified flying object

Rhymes for unidentified

• acetaldehyde
• acetanilide
• arabinoside
• cycloheximide
• cyclophosphamide
• diethylamide
• dinucleotide
• ferricyanide
• ferrocyanide
• glutaraldehyde
• glyceraldehyde
• hydroperoxide