clear as mud
Murky, obscure, totally unclear, as in The translation of these directions is clear as mud. This ironic phrase always indicates that something is far from clear. [Early 1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
How to use clear as mud in a sentence
"I thought so, Doctor," says Mrs. Helpalong, and this clear-as-mud evidence against my comfort is reiterated to my mother.
The Swamp Doctor's Adventures in The South-West | John Robb
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