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GRUMBLING

Definition:

[noun] a loud low dull continuous noise; "they heard the rumbling of thunder"
Synonyms: rumble, rumbling, grumble
[noun] a complaint uttered in a low and indistinct tone
Synonyms: grumble, murmur, murmuring, mutter, muttering
[adjective] continuous full and low-pitched throbbing sound; "the rumbling rolling sound of thunder"
Synonyms: rumbling
[adjective] muttering discontentedly; "the grumbling boarders requested a meeting with the cook"