mumble
/ˈmʌmbəl/ noun B2- A quiet or unintelligible vocalization; a low tone of voice. · All I could hear was a mumble from the next room.· He spoke in a barely comprehensible mumble.
Plural mumbles
From the library
For an instant the wrinkles were smoothed away, the nose drew away from the chin, the lower lip ceased to protrude and the mouth to mumble, the dull eyes regained their fire, the drooping figure expanded.
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