Dictionary Check: grumbling

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"grumbling" is a valid word!

Scrabble 15 points

Words with Friends 22 points

adjective

continuous full and low-pitched throbbing sound

Example: "the rumbling rolling sound of thunder"

Synonyms:

noun

a loud low dull continuous noise

Example: "they heard the rumbling of thunder"

Synonyms:

noun

a complaint uttered in a low and indistinct tone

Synonyms:

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