Definition of undetectable
: unable to be detected : impossible to discover or notice : not detectable an almost undetectable change undetectable traces of poison Signs of life may be so minimal as to be undetectable by modern instruments … — Lauren J. Livo
undetectablyplay \ˌən-di-ˈtek-tə-blē, -dē-\ adverb an undetectably small change
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