clear as mud
Meaning
Not clear at all; very confusing or hard to understand (often said sarcastically).
Origin
An ironic/sarcastic comparison: mud is opaque and murky, so calling something “clear as mud” highlights that it is the opposite of clear. It’s been used in English since at least the 19th century.
Notes
Sarcastic/ironic: means “not clear at all.” Used to express mild frustration or disbelief; can sound snarky in formal/professional contexts.
Examples
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After the meeting, the new workflow was still clear as mud to the rest of the team.
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The instructions in the manual are clear as mud, so I had to watch a tutorial instead.
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He tried to explain the billing changes, but his answer was clear as mud.
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The professor’s diagram was supposed to simplify things, yet it made the concept clear as mud.
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If your directions are this clear as mud, we’re going to end up at the wrong station.
Grammar & Usage Notes
Typically used as a predicate complement: “It’s clear as mud.” Can modify a noun phrase: “a clear-as-mud explanation.” Fixed wording; rarely changed.
Synonyms
- confusing
- unclear
- opaque
- hard to follow
- murky
Antonyms
- clear as day
- crystal clear
- transparent