unnoticeable (
http://definr.com/unnoticeable)
adj 1: not obtrusive or undesirably noticeable; "a quiet,
unobtrusive life of self-denial" [syn:
unobtrusive]
[ant:
obtrusive]
2: not noticeable; not drawing attention; "her clothes were
simple and unnoticeable"- J.G.Cozzens [ant:
noticeable]
3: not drawing attention; "an unnoticeable cigarette burn on
the carpet"; "an obscure flaw" [syn:
obscure]