The wicked shall be turned into hell, and all the nations that forget God. The wicked shall be turned into hell - לשאולה lisholah, headlong into hell, down into hell. The original is very emphatic.
All the nations that forget God - They will not live in his fear. There are both nations and individuals who, though they know God, forget him, that is, are unmindful of of him, do not acknowledge him in their designs, ways and works. These are all to be thrust down into hell. Reader, art thou forgetful of thy Maker, and of Him who died for thee?