unmarked

Short definition from Wiktionary

Adjective

1. 1
   Not bearing identification.
2. 2
   Free from blemishes.
3. 3
   Not noticed.
4. 4
   Not marked, not closely followed by a defensive player.
5. 5
   Not having been marked, or assigned a score.
6. 6
   Not marked; not standing out as unusual.