The word "rustcovered" refers to something that is covered in rust, which could be a result of exposure to air, water, or other elements over time. Antonyms for "rustcovered" would refer to something that is not covered in rust, such as shiny, new, or polished. Other antonyms could include words like clean, gleaming, pristine, or spotless. These words describe things that have been well-maintained or were recently created, without any signs of rust or decay. In contrast, "rustcovered" implies something that is old, neglected, or has been subjected to harsh conditions.