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Adjective: unperceivable  ,ún-pu(r)'see-vu-bul
  1. Impossible or difficult to perceive by the mind or senses
    "colour is unperceivable to the touch";
    - imperceptible

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