imperceptible

[ im-per-sep-tuh-buhl ]
/ ˌɪm pərˈsɛp tə bəl /

adjective

very slight, gradual, or subtle: the imperceptible slope of the road.
not perceptible; not perceived by or affecting the senses.

noun

something not capable of being perceived by the senses: metaphysical speculation about imperceptibles.

Origin of imperceptible

From the Medieval Latin word imperceptibilis, dating back to 1520–30. See im-2, perceptible

OTHER WORDS FROM imperceptible

im·per·cep·ti·bil·i·ty, im·per·cep·ti·ble·ness, noun im·per·cep·ti·bly, adverb

Example sentences from the Web for imperceptibly

British Dictionary definitions for imperceptibly

imperceptible
/ (ˌɪmpəˈsɛptɪbəl) /

adjective

too slight, subtle, gradual, etc, to be perceived

Derived forms of imperceptible

imperceptibility or imperceptibleness, noun imperceptibly, adverb