adjective
incapable of being apprehended by the senses or intellect
imperceptible changes in temperature
Synonyms: impalpable, imponderable, inappreciable, indiscernible, insensible, intangible, invisible, unapparent, unappreciable, undiscernible, unobservable, unperceivable
Related Word: faint, inconspicuous, indistinct, indistinguishable, insignificant, obscure, undistinguishable, unnoticeable, vague; ephemeral, evanescent, fugitive, momentary; slight, trivial
Contrasted words: apparent, appreciable, discernible, observable, palpable, ponderable, sensible, visible
Antonyms: perceivable, perceptible