The word "most nontranslucent" means that something cannot be seen through. Therefore, the antonyms for this word would be "translucent," "transparent," or "clear." These words all indicate that an object or substance can be seen through with varying degrees of clarity. For example, glass is transparent, while frosted glass is translucent. Similarly, water may be considered clear, allowing visibility into its depths. In contrast, an opaque substance, such as metal or concrete, blocks all light from passing through it, making it impossible to see through. By understanding the antonyms of "most nontranslucent," it is easier to describe the properties of various materials and substances.