UNMARKED
unmarked
(adjective) not having an identifying mark; “unmarked cards”; “an unmarked police car”
overlooked, unmarked, unnoted
(adjective) not taken into account; “his retirement was not allowed to go unmarked”
Source: WordNet® 3.1
Etymology
Adjective
unmarked (not comparable)
Not bearing identification.
Free from blemishes.
Not noticed.
(sports) Not marked, not closely followed by a defensive player.
Not having been marked, or assigned a score.
(linguistics) Not marked; not standing out as unusual.
Synonyms
• (not bearing identification): anonymous, undercover
• (free from blemishes): like new, mint, pristine
• (not noticed): overlooked
Source: Wiktionary