ABYSS

[noun] [C] - a very deep hole which seems to have no bottomHe was killed in a climbing accident when a rope broke and he fell into an abyss.Space is like an abyss.(figurative) The country is sinking/plunging into an abyss (= bad state) of violence and lawlessness.(figurative literary) She found herself on the edge of an abyss (= having to deal with a very difficult situation).