"unidentified" in the adjective sense
1. unidentified
not yet identified
"an unidentified species"
"an unidentified witness"
2. nameless, unidentified, unknown, unnamed
being or having an unknown or unnamed source
"a poem by an unknown author"
"corporations responsible to nameless owners"
"an unnamed donor"
Source: WordNet® (An amazing lexical database of English)
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