反義詞是unidentified,例如:
1、He was shot this morning by unidentified intruders at his house.他今天早上在家中被身份不明的闖入者射殺。
2、The painting was sold to an unidentified American dealer.這幅畫賣給了一名未披露姓名的美國商人。
3、The document was excerpted from an unidentified FBI file.此文件摘自來源不明的聯邦調查局檔案。