1. having no marks, signs, or identifying features
2. not noticed or observed
3. not graded or corrected by a teacher
Usage: education

Examples

• The police drove an unmarked car to avoid detection.
• She left the grave unmarked with no headstone.
• His absence from the meeting went unmarked by his colleagues.
• The teacher returned a stack of unmarked papers.
• The unmarked trail was difficult to follow.
• An unmarked package arrived at the office.
• The error in his report remained unmarked.