Undetectable

adj

Definitions

Adjective
  1. 1
    Unable to be detected; not detectable.

    "In these days of “rolled” gold, electro-plate, and undetectable pearls, it is curious that almost the only honest Ersatz material known to the goldsmith's art should be utterly forgotten."

Adjective
  1. 1
    barely able to be perceived wordnet
  2. 2
    not easily seen wordnet

Etymology

From un- + detectable.

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