We found 10 dictionaries that define the word dull as ditchwater:

General (4 matching dictionaries)

1. (as) dull as ditchwater, dull as ditchwater: Merriam-Webster
2. dull as ditchwater: Wiktionary
3. dull as ditchwater: Dictionary.com
4. dull as ditchwater: TheFreeDictionary.com

Business (1 matching dictionary)

5. dull as ditchwater: Legal dictionary

Computing (1 matching dictionary)

6. dull as ditchwater: Encyclopedia

Medicine (1 matching dictionary)

7. dull as ditchwater: Medical dictionary

Miscellaneous (1 matching dictionary)

8. dull as ditchwater: Idioms

Slang (2 matching dictionaries)

9. dull as ditchwater: English slang and colloquialisms used in the United Kingdom
10. dull as ditchwater: Urban Dictionary

Definitions from Wiktionary (dull as ditchwater) ▸ adjective:  (simile) Alternative form of dull as dishwater [(simile) Boring; ordinary; exceedingly dull.] Similar: dull as dishwater, dead as ditch-water, dry as dust, dull, boring as beans, sodden, weak as water, blah, dullardly, dumpish, more... Opposite: exciting, thrilling, captivating, engaging, stimulating Phrases: as dull as ditchwater, more... ▸ Words similar to dull as ditchwater ▸ Usage examples for dull as ditchwater ▸ Idioms related to dull as ditchwater ▸ Wikipedia articles (New!) ▸ Popular nouns described by dull as ditchwater ▸ Words that often appear near dull as ditchwater ▸ Rhymes of dull as ditchwater ▸ Invented words related to dull as ditchwater