We found 20 dictionaries that define the word mumbler:

General (17 matching dictionaries)

1. mumbler: Merriam-Webster
2. mumbler: Oxford Learner's Dictionaries
3. mumbler: Collins English Dictionary
4. mumbler: Vocabulary.com
5. mumbler: Wiktionary
6. Mumbler, mumbler: Dictionary.com
7. Mumbler: Online Plain Text English Dictionary
8. mumbler: Webster's Revised Unabridged, 1913 Edition
9. mumbler: Rhymezone
10. Mumbler: AllWords.com Multi-Lingual Dictionary
11. mumbler: Webster's 1828 Dictionary
12. mumbler: FreeDictionary.org
13. mumbler: Mnemonic Dictionary
14. mumbler: TheFreeDictionary.com
15. mumbler: Wordnik

Computing (1 matching dictionary)

16. mumbler: Encyclopedia

Slang (2 matching dictionaries)

17. mumbler: Green’s Dictionary of Slang
18. mumbler: Urban Dictionary

(Note: See mumble as well.)

Definitions from WordNet (mumbler) ▸ noun:  a person who speaks indistinctly Opposite: articulate, enunciator, clear speaker ▸ Words similar to mumbler ▸ Usage examples for mumbler ▸ Idioms related to mumbler ▸ Wikipedia articles (New!) ▸ Popular adjectives describing mumbler ▸ Words that often appear near mumbler ▸ Rhymes of mumbler ▸ Invented words related to mumbler