/ Dictionary / Index R rumbly: Meaning and Definition of Find definitions for: rum•bly Pronunciation: (rum'blē), [key] — adj. attended with, making, or causing a rumbling sound. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rumbling rumbustious Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language