We found 9 dictionaries that define the word clear as mud:

General (4 matching dictionaries)

1. clear as mud: Collins English Dictionary
2. (as) clear as mud: Cambridge Advanced Learner's Dictionary
3. clear as mud: Wiktionary
4. clear as mud: TheFreeDictionary.com

Business (2 matching dictionaries)

5. clear as mud: Legal dictionary
6. clear as mud: Financial dictionary

Computing (1 matching dictionary)

7. clear as mud: Encyclopedia

Medicine (1 matching dictionary)

8. clear as mud: Medical dictionary

Miscellaneous (1 matching dictionary)

9. clear as mud: Idioms

Definitions from Wiktionary (clear as mud) ▸ adjective:  (simile, sarcastic) Unclear; difficult or impossible to understand or interpret. Similar: muddly, turbid, muddy, hazy, blurry, mirky, murky, cloudy, foggy, clouded, more... Opposite: crystal clear, unambiguous, lucid, transparent, evident Phrases: as clear as mud, more... ▸ Words similar to clear as mud ▸ Usage examples for clear as mud ▸ Idioms related to clear as mud ▸ Wikipedia articles (New!) ▸ Popular nouns described by clear as mud ▸ Words that often appear near clear as mud ▸ Rhymes of clear as mud ▸ Invented words related to clear as mud