1. most opaque; least transparent or translucent
Usage: superlative form of opaque
2. most difficult to understand or explain
Usage: superlative form of opaque; figurative

Examples

• The opaquest glass in the collection completely blocked all light.
• This is the opaquest explanation I’ve ever heard for such a simple concept.
• Among all the materials tested, lead was the opaquest to radiation.
• The professor’s opaquest lecture left students more confused than before.
• The opaquest section of the window provided the most privacy.