In a sport such as football, hockey, or basketball, if a player is unmarked, there are no players from the opposing team who are watching them in order to challenge them when they have control of the ball. Sheringham was unmarked as he met Anderton's free kick and headed in after nine minutes. something that is unmarked has no words or signs on it to show where or what it is
Something that is unmarked has no marking on it which identifies what it is or whose it is. He had seen them come out and get into the unmarked police car He lies in an unmarked grave at Elmton