Suffering is the kind of pain you feel when you shatter your ankle and it's what you'll see all around you if you find yourself in the middle of a tornado or an earthquake.
When you're suffering, you're not happy — in fact, you're quite miserable. The Latin roots that give us suffering and related words paint a vivid picture of what suffering feels like. The word comes from sub-, meaning "below," and ferre, "bear." Suffering is something pressing you down that you have to submit to and bear. It's definitely the opposite of fun.