'Bitter' in the Bible

You who make the work of judging a bitter thing, crushing down righteousness to the earth;

Is it possible for horses to go running on the rock? may the sea be ploughed with oxen? for the right to be turned by you into poison, and the fruit of righteousness into a bitter plant?

Your feasts will be turned into sorrow and all your melody into songs of grief; everyone will be clothed with haircloth, and the hair of every head will be cut; I will make the weeping like that for an only son, and the end of it like a bitter day.