[{"Bold_text": "verb (used without object)", "List Items": ["to speak in a low indistinct manner, almost to an unintelligible extent; mutter.Antonyms: articulate", "to chew ineffectively, as from loss of teeth:to mumble on a crust."]}, {"Bold_text": "verb (used with object)", "List Items": ["to say or utter indistinctly, as with partly closed lips:He mumbled something about expenses.", "to chew, or try to eat, with difficulty, as from loss of teeth."]}, {"Bold_text": "noun", "List Items": ["a low, indistinct utterance or sound."]}]