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Basically, I'm looking for something similar to this:

"His reasoning was as clear as dirt."

Are there any other common expressions like that?

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up vote 5 down vote accepted

As clear as a black rock at the bottom of a deep well at midnight during a lunar eclipse.

You can make them up as you go along, really, but the most common one I've heard is "clear as mud".

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Ah yes, "clear as mud", not "clear as dirt". Thanks. – scribu Oct 14 '11 at 5:52

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