The Collaborative International Dictionary
Imperceptibleness
Imperceptible \Im`per*cep"ti*ble\, a. [Pref. im- not + perceptible: cf. F. imperceptible.] Not perceptible; not to be apprehended or cognized by the senses; not discernible by the mind; not easily apprehended.
Almost imperceptible to the touch.
--Dryden.
Its operation is slow, and in some cases almost
imperceptible.
--Burke.
-- Im`per*cep"ti*ble*ness, n. -- Im`per*cep"ti*bly, adv.
Their . . . subtilty and imperceptibleness.
--Sir M.
Hale.