to say something indistinctly and quietly, making it difficult for others to hear
He tends to mumble when he is nervous.
Please don't mumble, speak clearly so everyone can understand.
The old man mumbled to himself as he walked down the street.
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mumble an apology
mumble under breath
mumble responses
murmur
whisper
mutter
babble
An indistinct or quiet utterance
His mumble made it difficult for others to understand him.
The child's constant mumble was a source of frustration for the teacher.
I could hear a faint mumble coming from the next room.
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soft mumble
incoherent mumble
audible mumble
mutter
murmur
whisper