사람들의 눈에 띄지 않거나 주의를 끌지 못하는
Not seen, heard, or recognized; failing to attract attention or observation.
예문:
"The thief managed to enter the building unnoticed by the security guards."
"Many of her contributions to the project went unnoticed for a long time."
"A small crack in the foundation remained unnoticed for years."