The word "seepproof" typically refers to something that is resistant to seepage or leakage. Synonyms for this word might include "watertight," "impermeable," "impervious," "hermetic," "airtight," or "sealed." These terms all indicate that there is no way for any liquid or gas to pass through a particular substance or object. Other potential synonyms for "seepproof" could include related words like "water-resistant," "leak-proof," "weatherproof," or "resilient." Each of these terms could be used to describe a material or product that is able to withstand various environmental conditions, ensuring that it remains protected and functional for as long as possible.