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

adj 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
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
show more antonyms...

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