Definition of unnoticed adjective from the Oxford Advanced Learner's Dictionary

 

unnoticed

 adjective
adjective
BrE BrE//ˌʌnˈnəʊtɪst//
 
; NAmE NAmE//ˌʌnˈnoʊtɪst//
 
[not before noun]
 
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not seen or noticed His kindness did not go unnoticed by his staff. Her death passed almost unnoticed.Extra examples She slipped away unnoticed from the party. The ticket lay unnoticed in my desk drawer for a week. There’s a good chance my absence will go completely unnoticed. a hitherto unnoticed detail
See the Oxford Advanced American Dictionary entry: unnoticed