What does "opaque" refer to in general context?

The term "opaque" generally refers to a substance or material that does not allow light to pass through it, making it not transparent. In a broader context, when something is described as opaque, it can also imply that it is difficult to understand or perceive clearly. In contrast, the other options describe states of visibility or clarity which are not compatible with the definition of "opaque." For instance, something that is transparent and clear allows light to pass through and can be easily seen through, which is the opposite of opaque. Similarly, reflective and shiny surfaces can still allow some light interaction but do not define opacity. Visible from afar suggests clarity and perceivability, again contrary to the idea of being opaque. Therefore, the definition of "not transparent" aligns perfectly with the established meaning of the word.