rumbling

Noun · Adjective

WordNet 3.0

Noun (1)

1. a loud low dull continuous noise“they heard the rumbling of thunder”Synonyms: rumblegrumblegrumbling

Adjective (1)

1. continuous full and low-pitched throbbing sound“the rumbling rolling sound of thunder”Synonyms: grumbling

Webster's Dictionary (GCIDE)

Rumbling \Rum"bling\, a. & n. from Rumble, v. i. [1913 Webster]