undetectable

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adjective un·de·tect·able \ˌən-di-ˈtek-tə-bəl, -dē-\

Definition of undetectable

  1. :  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

undetectably

play \ˌən-di-ˈtek-tə-blē, -dē-\ adverb an undetectably small change

1863

First Known Use of undetectable

1863

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