1. not allowing light to pass through; not transparent
2. difficult to understand or explain; unclear

Examples

• The opaque glass prevented us from seeing inside the building.
• Heavy curtains made the windows completely opaque.
• The professor’s explanation was so opaque that no one understood it.
• The company’s financial records were deliberately opaque.
• Milk is opaque, while water is transparent.
• His writing style is often opaque and hard to follow.
• The fog was so thick it created an opaque wall across the highway.