[syn: grumble, grumbling, murmur, murmuring, mutter, muttering]
The Collaborative International Dictionary of English v.0.48:
Mutter \Mut"ter\, v. i. [imp. & p. p. Muttered; p. pr. & vb.
n. Muttering.] [Prob. of imitative origin; cf. L. muttire,
1. To utter words indistinctly or with a low voice and lips
partly closed; esp., to utter indistinct complaints or
angry expressions; to grumble; to growl.
Wizards that peep, and that mutter. --Is. viii.
Meantime your filthy foreigner will stare,
And mutter to himself. --Dryden.
2. To sound with a low, rumbling noise.
Thick lightnings flash, the muttering thunder rolls.
WordNet (r) 3.0 (2006):
n 1: a low continuous indistinct sound; often accompanied by
movement of the lips without the production of articulate
speech [syn: mutter, muttering, murmur, murmuring,
2: a complaint uttered in a low and indistinct tone [syn:
grumble, grumbling, murmur, murmuring, mutter,
Moby Thesaurus II by Grady Ward, 1.0:
79 Moby Thesaurus words for "muttering":
aspiration, bated breath, beefing, bellyaching, bitching, breath,
breathy voice, complaining, complaintful, crabbing, crabby, cranky,
croaking, disappointed, discontented, disgruntled, displeased,
dissatisfied, drone, droning, envious, exhalation, faultfinding,
gabble, gibber, gibbering, griping, grouchy, grousing, growling,
grumbling, jabber, jibber, little voice, low voice, malcontent,
malcontented, maundering, mouthing, mumble, mumbling, murmur,
murmuration, murmuring, murmurish, murmurous, mutter, out of humor,
peevish, petulant, querulant, querulous, rebellious, resentful,
restive, restless, rustling, sigh, soft voice, stage whisper,
still small voice, sulky, susurrant, susurration, susurrous,
susurrus, unaccepting, unaccommodating, underbreath, undertone,
uneasy, unfulfilled, ungratified, unhappy, unsatisfied, whiny,
whisper, whispering, whispery