Grumbling

Definitions:

Noun

rumble rumbling grumble grumbling

Definition: a loud low dull continuous noise; "they heard the rumbling of thunder"

grumble grumbling murmur murmuring mutter muttering

Definition: a complaint uttered in a low and indistinct tone

Definition: complaining

Verb

Definition: present participle of grumble

Adjective

grumbling rumbling

Definition: continuous full and low-pitched throbbing sound; "the rumbling rolling sound of thunder"

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