grumble

(n) a loud low dull continuous noise
- they heard the rumbling of thunder
grumbling, rumble, rumbling,
(n) a complaint uttered in a low and indistinct tone grumbling, murmuring, mutter, muttering, murmur,

(v) show one's unhappiness or critical attitude
- He scolded about anything that he thought was wrong
- We grumbled about the increased work load
grouch, scold,
(v) make complaining remarks or noises under one's breath
- she grumbles when she feels overworked
gnarl, murmur, mutter, croak,
(v) to utter or emit low dull rumbling sounds
- he grumbled a rude response
- Stones grumbled down the cliff
growl, rumble,
(v) make a low noise
- rumbling thunder
rumble,

grumbling rumble rumbling grouch scold murmuring mutter muttering murmur gnarl croak growl

grumbler