Synonyms of mumble
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murmurIf you murmur something, you say it very quietly, so that not many people can hear what you are saying.
• He turned and murmured something to the professor.
• She spoke in a low murmur.
mutterIf you mutter, you speak very quietly so that you cannot easily be heard, often because you are complaining about something.
• He sat there shaking his head, muttering to himself.
Thesaurus for mumble from the Collins English Thesaurus