undetectable

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

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

undetectably

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

First Known Use of undetectable

1863


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