@previous (B)
obscure
əbˈskjʊə/
adjective
1.
not discovered or known about; uncertain.
"his origins and parentage are obscure"
synonyms:unclear, uncertain, unknown, in doubt, doubtful, dubious, mysterious, hazy, vague, indeterminate, concealed, hidden
"he was born about 1650 though his origins and parentage remain obscure