unmarked

/AH0 N M AA1 R K T/
adjective
  1. 1

    Not bearing identification.

    โ€œan unmarked highway patrol vehicleโ€

  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.

    โ€œThe teacher sat down to a pile of unmarked work.โ€

  6. 6

    Not marked; not standing out as unusual.

    โ€œThe use of that word in that context was unmarked.โ€

Source: https://en.wiktionary.org/wiki/unmarked