impossible to hear; imperceptible by the ear

impossible or difficult to perceive by the mind or senses

impossible or nearly impossible to see; imperceptible by the eye, not prominent or readily noticeable, a very dark shade of green, approaching to black, and liable to be mistaken for it, noun_ An invisible person or thing; specifically, God, the Supreme Being, A Rosicrucian_ so called because of the secret character of the organization

A measure of land, common in Domesday Book and old English charters, the quantity of which is not well ascertained, but has been differently estimated at 80, 100, and 120 acres, A medieval land measure equal to the amount of land that could sustain one free family; usually 100 acres Forty hides equalled a barony, verb_ be or go into hiding; keep out of sight, as for protection and safety, cover as if with a shroud, make undecipherable or imperceptible by obscuring or concealing, transitive verb_ To withhold from knowledge; to keep secret; to refrain from avowing or confessing, To remove from danger; to shelter, intransitive verb_ To lie concealed; to keep one's self out of view; to be withdrawn from sight or observation, a play of children, in which some hide themselves, and others seek them

make undecipherable or imperceptible by obscuring or concealing