undetectable

play
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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