grumbling

nouns

a loud low dull continuous noise
"they heard the rumbling of thunder"
grumble, grumbling, rumble, rumbling
is derived from
grumble
is derived from
grumble
a complaint uttered in a low and indistinct tone
grumble, grumbling, murmur, murmuring, mutter, muttering
is derived from
grumble

adjectives

continuous full and low-pitched throbbing sound
"the rumbling rolling sound of thunder"
grumbling, rumbling