unnoticed
adj.not seen or heard by anyone. You use this to describe something that happens without people paying attention to it.
adj.not observed, perceived, or remarked upon. Often used to describe subtle changes or actions performed discreetly.
“She tried to slip out of the room unnoticed.”
“The small error in the contract went unnoticed for months until a lawyer finally spotted it during a routine audit.”
“While the grand architectural changes were praised by the public, the subtle improvements to the building's structural integrity remained largely unnoticed by the casual observer.”
Often follows linking verbs like 'go', 'pass', or 'remain'.
Learners often try to add '-ly' to create an adverb, but 'unnoticed' is frequently used as a predicative adjective or a depictive secondary predicate.
“The team wanted to see if they could locate rare cell types in CAA that are often critical in cancer but can go unnoticed depending on the method used to detect them.”
“In those cases, evidence of life is present, yet it goes unnoticed.”
From un- + noticed.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.