Unidentified
/ˌʌnaɪˈdɛntəˌfaɪd/
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Definition
(adj) Not identified; having an unknown or unnamed identity.
Sentence Examples
UFO stands for unidentified flying object.
"What does U.F.O. stand for?" "It means Unidentified Flying Object, I guess."
CEFR Practice Quiz
The police are still trying to find the owner of the ____ vehicle that was parked in the restricted area today.