undetectable

Adjective
  1. Not easily seen (synset 302528909)
    similar to: invisible, unseeable - impossible or nearly impossible to see; imperceptible by the eye
  2. Barely able to be perceived (synset 301753420)
    "the transition was almost indiscernible"; "an almost insensible change"
    similar to: imperceptible, unperceivable - impossible or difficult to perceive by the mind or senses
    same as: indiscernible, insensible

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