If you describe someone or something as unidentified, you mean that nobody knows who or what they are. He was shot this morning by unidentified intruders at his house. unidentified cancer-causing substances in the environment. = unknown
being or having an unknown or unnamed source; "a poem by an unknown author"; "corporations responsible to nameless owners"; "an unnamed donor"
If you use unidentified to describe people, groups, and organizations, you do not want to give their names. his claims, which were based on the comments of anonymous and unidentified sources. = unnamed. an unidentified person or thing is one that you do not know the name of