What is the synonym of Opaque

The adjective "Opaque" describes something that is not able to be seen through; not transparent. It also refers to something difficult or impossible to understand. In its primary sense, it relates to the inability of light to pass through. The most fitting synonym among the choices is "Not clear," which directly conveys the idea of lacking transparency or being difficult to comprehend. For example, an "opaque window" prevents light from passing through, making it "not clear" to see outside. Similarly, "opaque language" is difficult to understand, meaning its meaning is "not clear." Options like "Transparent" and "Clear" are direct antonyms, as they describe materials or concepts that allow light or understanding to pass through easily. "Bright" is unrelated to the concept of transparency or clarity. Therefore, "Not clear" is the most accurate and encompassing synonym, capturing both the physical property of blocking light and the metaphorical sense of being incomprehensible.