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Adjective: imperceptible  `im-pur'sep-tu-bul
  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

Nearest

impenitent
impenitently
imperative
imperative form
imperative mood
imperatively
imperativeness
imperator
imperatorial
imperceptibility
imperceptible
imperceptibly
imperceptive
impercipient
imperfect
imperfect tense
imperfectibility
imperfectible
imperfection
imperfective
imperfective aspect