/ ʌnˈmɑːkt; NAmE ʌnˈmɑːrkt/ adjective
1.
without a sign or words to show what or where sth is :
an unmarked police car
He was buried in an unmarked grave.
—compare marked
2.
( especially BrE ) ( of a player in a team game, especially football ( soccer ) ) with no player from the other team staying close to prevent them from getting the ball :
He headed the ball to the unmarked Gray.
3.
( linguistics ) ( of a word or form of a word ) not showing any particular feature or style, such as being formal or informal
OPP marked