"Rough (unrefined)" refers to materials or substances that have not undergone processing or refinement. This can include natural resources like crude oil, which is extracted directly from the ground and requires further treatment to become usable fuel. Similarly, rough diamonds are uncut and unpolished stones that need to be shaped and refined to reveal their true beauty and value. In everyday language, "rough" can also describe surfaces that are not smooth or finished, such as rough wood or rough fabric. These items may have a raw, natural quality, often appreciated for their authenticity and character. Unrefined products can be used in various applications, emphasizing their original state.