grumble

Noun

• a complaint uttered in a low and indistinct tone

• a loud low dull continuous noise
  • they heard the rumbling of thunder
    

Verb

• make a low noise
  • rumbling thunder
    

• to utter or emit low dull rumbling sounds
  • he grumbled a rude response
    
  • Stones grumbled down the cliff
    

• make complaining remarks or noises under one's breath
  • she grumbles when she feels overworked
    

• show one's unhappiness or critical attitude
  • He scolded about anything that he thought was wrong
    
  • We grumbled about the increased work load
    

Related words

• Synonyms: 
  grumbling , murmur , murmuring , mutter , muttering , rumble , rumbling , growl , croak , gnarl , grouch , scold