1. Impossible or difficult to perceive by the mind or senses
   "an imperceptible drop in temperature"; "an imperceptible nod"
   - unperceivable

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

Antonym: perceptible

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