abyss

/ə-ˈbis/

borrowed from Late Latin abyssus, borrowed from Greek ábyssos "bottomless, unfathomable, (as noun) bottomless gulf," from a- + byssós "depth of the sea," probably going back to *byth-yos, derivative of bythós "depth, deepest part, bottom," probably of pre-Greek substratal origin

noun

  1. an immeasurably deep gulf or great space

  2. intellectual or moral depths

  3. the bottomless gulf, pit, or chaos of the old cosmogonies

gazed down into the gaping abyss

an abyss of moral depravity