Synonyms of 'unidentified'
He was shot this morning by unidentified intruders at his house.
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If you remain anonymous when you do something, you do not let people know that you were the person who did it.
You can remain anonymous if you wish.
Someone or something that is mysterious is strange and is not known about or understood.
He died in mysterious circumstances.
Thesaurus for unidentified from the Collins English Thesaurus
If you describe someone or something as unidentified , you mean that nobody knows who or what they are.