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

 

undetectable

 adjective
adjective
BrE BrE//ˌʌndɪˈtektəbl//
 
; NAmE NAmE//ˌʌndɪˈtektəbl//
 
 
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impossible to see or find The sound is virtually undetectable to the human ear. opposite detectable
See the Oxford Advanced American Dictionary entry: undetectable