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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