mutter
1. [ verb ] talk indistinctly; usually in a low voice
Synonyms: mumble mussitate maunder maffle
Related terms: talk mutterer mumbling
2. [ verb ] make complaining remarks or noises under one's breath
Synonyms: grumble gnarl croak murmur
Examples:

"she grumbles when she feels overworked"

Related terms: complain grumble
3. [ noun ] a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech
Synonyms: murmur muttering murmuring mussitation murmuration
Related terms: sound mumble murmur
4. [ noun ] Last name, frequency rank in the U.S. is 10862
5. [ noun ] a complaint uttered in a low and indistinct tone
Synonyms: grumbling murmuring murmur muttering grumble
Related terms: complaint murmur
Similar spelling:   mudder
  Motter
  matter
  mudra
  Mattera