c. 1400, "having been given no mark," from un- (1) "not" + past participle of mark (v.). Similar formation in Old Norse umarkaðr. Meaning "not noticed or observed" is recorded from 1530s.
unmarked cards
an unmarked police car
his retirement was not allowed to go unmarked
unmanageable
unmanaged
unmanly
unmanned
unmannerly
unmarked
unmarketable
unmarred
unmarried
unmask
unmastered
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