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Adjective: indiscernible  ,in-di'sur-nu-bul
  1. Barely able to be perceived
    "the transition was almost indiscernible";
    - insensible, undetectable
  2. Difficult or impossible to perceive or discern
    "an indiscernible increase in temperature"

See also: imperceptible, unperceivable

Antonym: discernible

Encyclopedia: Indiscernible