unmarked

柯林斯词典

1. ADJ Something that is unmarked has no marks on it. 无记号的
Her shoes are still white and unmarked. 她的鞋子仍是白色、无记号的。
2. ADJ Something that is unmarked has no marking on it which identifies what it is or whose it is. 没有标志的
He had seen them come out and get into the unmarked police car. 他看见他们出来了，进了没有标志的警车。