Mumble1. (v.) To speak with the lips partly closed, so as to render the sounds inarticulate and imperfect; to utter words in a grumbling indistinct manner, indicating discontent or displeasure; to mutter.
2. (v.) To chew something gently with closed lips.
3. (v. t.) To utter with a low, inarticulate voice.
4. (v. t.) To chew or bite gently, as one without teeth.
5. (v. t.) To suppress, or utter imperfectly.
Thesaurus Entries
aspirate, aspiration, bark, bated breath, bawl, bellow, bite, blare, blat, blubber, boom, bray, breath, breathe, breathy voice, buzz, cackle, champ, chant, chaw, chew, chew the cud, chew up, chirp, chomp, coo, crow, drawl, drone, droning, exclaim, exhalation, flute, fumble, gabble, gasp, gibber, gibbering, gnash, gnaw, grind, growl, grunt, gum, hammer, hiss, jabber, jibber, keen, lilt, limp, little voice, low voice, maffle, masticate, maunder, maundering, mouth, mouthing, muddle, mumbling, munch, murmur, murmuration, murmuring, mussitate, mutter, muttering, nibble, pant, pipe, roar, rumble, ruminate, rumor, scream, screech, shriek, shuffle, sibilate, sigh, sing, snap, snarl, snort, sob, soft voice, speak, speak incoherently, splutter, sputter, squall, squawk, squeal, stage whisper, stammer, still small voice, stumble, stutter, susurrate, susurration, susurrus, swallow, talk, thunder, trumpet, twang, underbreath, undertone, utter, verbalize, vocalize, voice, wail, warble, whine, whisper, whispering, yap, yawp, yell, yelp