We found 19 dictionaries that define the word duller:

General (14 matching dictionaries)

1. duller: Merriam-Webster
2. duller: Collins English Dictionary
3. duller: Vocabulary.com
4. Duller, duller: Wordnik
5. duller: Cambridge Advanced Learner's Dictionary
6. duller: Wiktionary
7. Duller, duller: Dictionary.com
8. duller: Cambridge Essential American English Dictionary
9. Duller: Online Plain Text English Dictionary
10. duller: Webster's Revised Unabridged, 1913 Edition
11. Duller: AllWords.com Multi-Lingual Dictionary
12. duller: Webster's 1828 Dictionary
13. duller: FreeDictionary.org
14. Duller: TheFreeDictionary.com

Business (1 matching dictionary)

15. duller: Legal dictionary

Computing (1 matching dictionary)

16. duller: Encyclopedia

Medicine (2 matching dictionaries)

17. duller: Merriam-Webster Medical Dictionary
18. duller: Medical dictionary

Miscellaneous (1 matching dictionary)

19. duller: Idioms

(Note: See dull as well.)

Definitions from Wiktionary (duller) ▸ noun:  One who, or that which, dulls. Similar: dullery, douser, dullard, dumbling, deepener, dullardry, dullardism, duncery, dryer, drownder, more... Opposite: sharper, brighter, more vibrant, more lively Types: sandpaper, steel wool, emery board, ceramic tile, steel, more... Adjectives: female, sharp, late, great, young, general ▸ Words similar to duller ▸ Usage examples for duller ▸ Idioms related to duller ▸ Wikipedia articles (New!) ▸ Popular adjectives describing duller ▸ Words that often appear near duller ▸ Rhymes of duller ▸ Invented words related to duller