(p. pr. & vb. n.) of Mutter.

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