An area of darkness; a place or region with no light.
"After the storm passed, the valley remained an opaque blackness until dawn broke through."
To make, render (more) opaque.
"The sudden power surge made the screen completely opaque before it shut down entirely."
not transmitting or reflecting light or radiant energy; impenetrable to sight
"opaque windows of the jail"
"opaque to X-rays"
hard or impossible to understand
"The professor's lecture was so full of jargon that it felt completely opaque, leaving everyone in the audience confused and frustrated."
Neither reflecting nor emitting light.
"The thick layer of oil on the water made the surface completely opaque, hiding everything beneath it from view."