unmarked

柯林斯词典

1. ADJ Something that is unmarked has no marks on it. 無記號的
Her shoes are still white and unmarked. 她的鞋子仍是白色、無記號的。
2. ADJ Something that is unmarked has no marking on it which identifies what it is or whose it is. 沒有標志的
He had seen them come out and get into the unmarked police car. 他看見他們出來了，進了沒有標志的警車。