Longman Dictionary of Contemporary English homepage

undetected

 adjective
     
un‧de‧tect‧ed
if something, especially something bad, goes undetected, no one notices it
go/remain undetected
Doctors can make mistakes and diseases can remain undetected.
The thieves escaped undetected through a basement window.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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