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Adjective: imperceptible  ,im-pu(r)'sep-tu-bul
  1. Impossible or difficult to perceive by the mind or senses
    "an imperceptible drop in temperature";
    - unperceivable

See also: impalpable, inaudible, incognisable [Brit], incognizable, incognoscible, indiscernible, insensible, invisible, subliminal, undetectable, unhearable, unobservable, unseeable

Antonym: perceptible

Encyclopedia: Imperceptible