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.
adj impossible or difficult to perceive by the mind or senses
impossible to hear; imperceptible by the ear
imperceptible to the senses or the mind
not perceptible to the touch
incapable of being perceived or known
indiscernible, insensible, undetectable
barely able to be perceived
below the threshold of conscious perception
not accessible to direct observation
impossible or nearly impossible to see; imperceptible by the eye
capable of being perceived by the mind or senses
heard or perceptible by the ear
capable of being detected
capable of being perceived clearly
deficient in magnitude; barely perceptible; lacking clarity or brightness or loudness etc
can be felt by palpation
capable of being perceived especially by sight or hearing
easily perceived; easy to become aware of
readily perceived by the senses
capable of being seen; or open to easy view
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