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

 

undetected

 adjective
adjective
BrE BrE//ˌʌndɪˈtektɪd//
 
; NAmE NAmE//ˌʌndɪˈtektɪd//
 
 
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not noticed by anyone How could anyone break into the palace undetected? The disease often goes/remains undetected for many years.
See the Oxford Advanced American Dictionary entry: undetected