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The phrase "are opaque and complex" is correct and usable in written English.
It can be used to describe something that is difficult to understand or not transparent, often in contexts like literature, systems, or processes.
Example: "The regulations surrounding the new policy are opaque and complex, making it hard for citizens to comprehend their rights."
Alternatives: "are unclear and intricate" or "are ambiguous and convoluted."
Exact(2)
Banks are opaque and complex firms.
Its judgments – of Grace's parents who couldn't cope, and of the Briar – are opaque and complex.
Similar(58)
My point is, the financials of the loyalty-industrial complex are opaque and incomprehensible to all but a few insiders.
Party congresses are opaque and unpredictable.
The puddles are opaque and milky.
The user interface was described as confusing by Nintendo Gamer, and while Edge felt that the interface was "simple to the point of crudity", it could also be "opaque and cluttered, making a reasonably complex game seem even more so".
The tax code is opaque and regulations for business are notoriously complex.
The situation is too complex: the regime is opaque and riven by factional disputes; the Islamists are fragmented and distasteful to the West; the discordant parties that occupy the middle ground remain weak.
For starters, it is opaque and confusing.
Lead paint is opaque and water-resistant.
The flesh should be opaque and juicy.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com