Undetected
/ˌʌndɪˈtɛktɪd/
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Definition
(adj) Not found; undiscovered.
Sentence Examples
It would be impossible to estimate how many crimes went undetected last year.
Seek and you shall find, what is unsought will go undetected.
CEFR Practice Quiz
The problem remained ____ for many months until a routine inspection finally revealed several major issues today.