indiscernible

Adjective
  1. Difficult or impossible to perceive or discern (synset 300584515)
    "an indiscernible increase in temperature"
  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: insensible, undetectable

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