This is one of the world's most opaque regimes.

Part of this snow, which is not dissolved during summer, impregnated with rain and snow-water, is frozen during winter, and forms that opaque and porous ice of which the Lower Glaciers are composed.

When Scrooge awoke, it was so dark, that looking out of bed, he could scarcely distinguish the transparent window from the opaque walls of his chamber.

Listening to a Portuguese conversation is an unreal experience. A completely opaque string of phonemes, occasionally punctuated by a crystal-clear "Sim, senhor."

The day pulls to a close" is a barbarism, possibly entirely opaque if you fail to recognize it as a translation of "The day draws to a close."

Some businesses complain of opaque regulations and unequal enforcement of the law.

The truth is opaque and consequently imperceptible.

Things are very opaque in Algeria.

Opaque? Not at all. Intuitively obvious to the most casual observer.

You don't know what that small opaque bottle contains.