1. (

• mutter ,
• muttering ,
• murmur ,
• murmuring ,
• murmuration ,
• mussitation

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

2. (

• grumble ,
• grumbling ,
• murmur ,
• murmuring ,
• mutter ,
• muttering

) a complaint uttered in a low and indistinct tone ;

1. (

• mumble ,
• mutter ,
• maunder ,
• mussitate

) talk indistinctly; usually in a low voice ;

2. (

• murmur ,
• mutter ,
• grumble ,
• croak ,
• gnarl

) make complaining remarks or noises under one's breath; "she grumbles when she feels overworked" ;