Sloping downward is a term used to describe the direction of a surface that is going downwards. It can be used to refer to a slope, a hill, or even a staircase. There are many synonyms for this term, depending on the context in which it is used. Some of these synonyms include inclined, slanted, angled, tilted, deviating, dipping, leaning, descending, declining, and dropping. Each of these words has its own nuances, so it's important to choose the right one for the specific situation. Regardless of the word chosen, the meaning remains the same - a surface that is going downward at an angle.