From The Collaborative International Dictionary of English v.0.44 [gcide]:
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
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
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