Opaque

Real World Example

Imagine trying to have a conversation with a friend in a noisy cafe where you can't hear each other over the background chatter. Just as the noise in the cafe prevents your words from reaching your friend, an opaque material stops light from passing through it. In both cases, whether it's sound or light, there's a barrier that prevents the intended communication or transmission from occurring, with the cafe noise akin to the opacity of a material blocking the light's path.