imperceptible Meaning, Definition & Usage

  1. adjective impossible or difficult to perceive by the mind or senses
    unperceivable.
    • an imperceptible drop in temperature
    • an imperceptible nod
    • color is unperceivable to the touch

WordNet

Im`per*cep"ti*ble adjective
Etymology
Pref. im- not + perceptible: cf. F. imperceptible.
Definitions
  1. Not perceptible; not to be apprehended or cognized by the souses; 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 . . . subility and imperceptibleness. Sir M. Hale.

Webster 1913