very slight, gradual, or subtle
: the imperceptible slope of the road.
not perceptible; not perceived by or affecting the senses.
something not capable of being perceived by the senses: metaphysical speculation about imperceptibles.
Origin: 1520–30; Related forms
< Medieval Latin imperceptibilis.
imperceptibility, imperceptibleness, noun
2. hidden, unperceivable, undetectable.