adjective
not attracting attention or notice
adverb
in a way that does not attract attention or notice
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The small changes in the company's policy went unnoticed by most employees.
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I left the party early and went unnoticed by everyone.
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I slipped out of the meeting unnoticed like a ninja.
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Her hard work often goes unnoticed, but she doesn't mind as long as she knows she's making a difference.