un ‧ i ‧ den ‧ ti ‧ fied /ˌʌnaɪˈdentəfaɪd◂, ˌʌnaɪˈdentɪfaɪd◂/ BrE AmE adjective
[ Word Family: noun : ↑ identification , ↑ identity ; adjective : ↑ identifiable , ↑ unidentified ; verb : ↑ identify ]
an unidentified person or thing is one that you do not know the name of:
An unidentified man was spotted near the scene of the crime.