1.
Something that is ~ has no marks on it.
Her shoes are still white and ~.
ADJ: usu v-link ADJ
2.
Something that is ~ has no marking on it which identifies what it is or whose it is.
He had seen them come out and get into the ~ police car...
He lies in an ~ grave at Elmton.
ADJ: usu ADJ n
3.
In a sport such as football, hockey, or basketball, if a player is ~, there are no players from the opposing team who are watching them in order to challenge them when they have control of the ball. (BRIT)
Sheringham was ~ as he met Anderton’s free kick and headed in after nine minutes.
ADJ: usu v-link ADJ, also ADJ after v