mumble
verb
[ ˈmʌmb(ə)l ]
• say something indistinctly and quietly, making it difficult for others to hear.
• "he mumbled something she didn't catch"
Similar:
mutter,
murmur,
speak indistinctly,
talk under one's breath,
speak sotto voce,
talk to oneself,
maffle,
• bite or chew (something) with toothless gums or without making much use of the teeth.
• "she mumbled a piece of black bread"
mumble
noun
• a quiet and indistinct utterance.
• "Rosie had replied in a mumble"
Origin:
Middle English: frequentative of mum2.