1) Blending in 2) Disregarded 3) Forgotten 4) Ignored 5) Neglected 6) Not noticed 7) Not spotted 8) Overlooked 9) Unheeded 10) Unmarked 11) Unnoted 12) Unobserved 13) Unperceived 14) Unremarked 15) Unseen 16) Without being seen 1) Disregarded 2) Forgotten 3) Hidden 4) Ignored 5) Neglected 6) Note less 7) Overlooked 8) Undistinguished 9) Unheeded 10) Unnoted 11) Unperceived 12) Unremarked 
[adj] - not noticed
adjective not noticed; `hoped his departure had passed unnoticed`