a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech

[ Syn: muttering , murmur , murmuring , murmuration , mussitation ]

a complaint uttered in a low and indistinct tone

[ Syn: grumble , grumbling , murmur , murmuring , muttering ]

talk indistinctly; usually in a low voice

[ Syn: mumble , maunder , mussitate ]

make complaining remarks or noises under ones breath; she grumbles when she feels overworked

[ Syn: murmur , grumble , croak , gnarl ]