muttering Meaning, Definition & Usage

1. noun a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech
   murmuring; mutter; murmuration; murmur; mussitation.
   
2. noun a complaint uttered in a low and indistinct tone
   murmuring; grumbling; grumble; mutter; murmur.
   
3. verb talk indistinctly; usually in a low voice
   mussitate; maunder; mumble; mutter.
   
4. verb make complaining remarks or noises under one's breath
   grumble; gnarl; mutter; murmur; croak.
   
   • she grumbles when she feels overworked

WordNet