unnoticed
Definitions
Not observed or perceived; failing to attract attention.
Not remarked upon or commented on.
Examples
She slipped out of the room unnoticed while everyone was distracted by the presentation.
The subtle changes in his behavior did not go unnoticed by his observant mother.
He managed to walk past the security guard completely unnoticed.
Synonyms
overlooked ignored unobserved unseen undetected unperceived neglected