from
The Collaborative International Dictionary of English v.0.48
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.
[1913 Webster]
Almost imperceptible to the touch. --Dryden.
[1913 Webster]
Its operation is slow, and in some cases almost
imperceptible. --Burke.
-- {Im`per*cep"ti*ble*ness}, n. -- {Im`per*cep"ti*bly}, adv.
[1913 Webster]
Their . . . subtilty and imperceptibleness. --Sir M.
Hale.
[1913 Webster]