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Grumbling (Noun)

A loud low dull continuous noise; "they heard the rumbling of thunder".

Nouns denoting natural events.

A complaint uttered in a low and indistinct tone.

Nouns denoting communicative processes and contents.

The constant grumbling from the back of the room made it hard to focus on the presentation.
Her grumbling about the weather was a daily ritual that everyone had grown accustomed to.
The grumbling from the crowd grew louder as the concert started late for the third time that week.
His grumbling about the food was so loud that the waiter came over to ask if everything was okay.
The grumbling from the engine was a sign that the car was in desperate need of a tune-up.