Non-translucent refers to objects that do not allow light to pass through them, causing them to appear opaque or dark. The antonyms to this term, therefore, would describe objects that are transparent or clear. The term "translucent" refers to objects that allow partial light transmission, such as frosted glass, wax paper, or waxed tissue paper. Clear, see-through, and crystal-clear are a few antonyms that can be used to communicate the opposite of non-translucent. Other terms that can be used in opposition of non-translucent include diaphanous, gossamer, and lucid, and all these words suggest a sense of clarity or brightness in appearance.