unnoticed

unobserved, unperceived, unseen, unheeded, overlooked, inconspicuous, secret, hidden, passed by, unobtrusive, disregarded, unconsidered, unattended, neglected, unrespected, unmarked, unremembered, unscrutinized, unremarked, uncontemplated, unrecognized, slurred over, uninspected, winked at, connived at, glossed over, lost sight of, ignored, shoved into the background, undistinguished, unexamined, unwatched, unlooked at.

Antonyms watched*, noticed, seen.