Synonym: mutter. Similar words: humble, rumble, jumbled, stumble, grumble, crumble, humbly, amble. Meaning: ['mʌmbl] 
n. a soft indistinct utterance. v. 1. talk indistinctly; usually in a low voice 2. grind with the gums; chew without teeth and with great difficulty.
n. a soft indistinct utterance. v. 1. talk indistinctly; usually in a low voice 2. grind with the gums; chew without teeth and with great difficulty. 
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31. For goodness'sakes, Lucy Marian, speak up! I can't abide children who mumble.
32. I must speak clearly and to the point. I must not talk too fast or mumble.