WORTHLESS MATERIAL is a term used to describe materials that have no value or use. DROSS (5 letters) is a waste product of smelting or refining processes, such as the production of metals. REFUSE (6 letters) is any unwanted material, such as garbage or trash. LANDFILL (8 letters) is a site where waste is buried and left to decompose. All of these terms refer to materials that are considered worthless and are often disposed of in an environmentally-friendly manner.