to speak in a low indistinct manner, almost to an unintelligible extent; mutter.

to chew ineffectively, as from loss of teeth

to mumble on a crust.

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.

a low, indistinct utterance or sound.

verb

speak clearly

verb

grumble , maunder , murmur , mutter , ramble , rumble , say to oneself , speak , stammer , stutter , swallow , talk , utter , verbalize , vocalize , voice , whimper , whine , whisper , chew , mouth , mump , patter

noun

sigh , sough , susurration , susurrus , whisper