imperceptible

If it's imperceptible, it's impossible to perceive with any of the senses. The world might be spinning, but it's imperceptible from your couch.

Within the word imperceptible you see the word percept, which means "the object of your perception." Like impossible, the im in imperceptible means it cannot be perceived. Imperceptible is rarely used in the absolute sense of the word — it is usually paired with almost. Horton hears the Who but the tiny sounds of the Whos were almost imperceptible to everyone else.

Definitions of imperceptible
  1. adjective
    impossible or difficult to perceive by the mind or senses
    “an imperceptible drop in temperature”
    “an imperceptible nod”
    synonyms: unperceivable
    inaudible, unhearable
    impossible to hear; imperceptible by the ear
    impalpable
    imperceptible to the senses or the mind
    impalpable
    not perceptible to the touch
    incognizable, incognoscible
    incapable of being perceived or known
    indiscernible, insensible, undetectable
    barely able to be perceived
    subliminal
    below the threshold of conscious perception
    unobservable
    not accessible to direct observation
    invisible, unseeable
    impossible or nearly impossible to see; imperceptible by the eye
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    Antonyms:
    perceptible
    capable of being perceived by the mind or senses
    audible, hearable
    heard or perceptible by the ear
    detectable, noticeable
    capable of being detected
    discernible
    capable of being perceived clearly
    faint, weak
    deficient in magnitude; barely perceptible; lacking clarity or brightness or loudness etc
    palpable
    can be felt by palpation
    perceivable
    capable of being perceived especially by sight or hearing
    recognizable
    easily perceived; easy to become aware of
    sensible
    readily perceived by the senses
    seeable, visible
    capable of being seen; or open to easy view
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