Synonyms for mumble

verb

to mumble is to utter almost inaudible or inarticulate sounds in low tones, with the mouth nearly closed an old woman mumbling to herself; murmur implies a continuous flow of words or sounds in a low, indistinct voice and may apply to utterances of satisfaction or dissatisfaction to murmur a prayer; mutter usually suggests angry or discontented words or sounds of this kind to mutter curses