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undetectable

 
Adjective undetectable has 2 senses
  1. undetectable - not easily seen
    Antonyms:
    visible, seeable (indirect, via invisible)
  2. indiscernible, insensible, undetectable - barely able to be perceived; "the transition was almost indiscernible"; "an almost insensible change"
    Antonym: perceptible (indirect, via imperceptible)
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