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

• anonymous
• certain
• given
• one
• some
• unnamed
• unspecified

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

The 57-page lawsuit alleges that Ibrahim was lured to the gym under the pretense of a challenge and then attacked by Watson, a co-owner of the gym and two unidentified men. —Theo Karantsalis, Miami Herald, 13 June 2025

In June, the administration of U.S. President Trump slapped several unidentified officials from Central America with visa restrictions. —Dánica Coto, Los Angeles Times, 13 June 2025

Jane said the escort who ended up joining them was the same one from the birthday party hosted by the unidentified rapper. —Cheyenne Roundtree, Rolling Stone, 12 June 2025

The new brown dwarfs also exhibit signals from an unidentified hydrocarbon, a chemical compound composed solely of hydrogen and carbon atoms. —Robert Lea, Space.com, 12 June 2025

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