the act of a person, animal, or thing that roars.

a loud, deep cry or sound or a series of such sounds.

Veterinary Pathology . a disease of horses, caused by respiratory obstruction or vocal cord paralysis, and characterized by loud or rough breathing sounds.

making or causing a roar, as an animal or thunder.

brisk or highly successful, as trade

He did a roaring business selling watches to tourists.

characterized by noisy, disorderly behavior; boisterous; riotous

roaring revelry.

complete; utter; out-and-out

a roaring idiot; a roaring success.

very; extremely

roaring drunk.

adjective

blaring , deafening , earsplitting , stentorian , booming , boomy , prospering , prosperous , thrifty , thriving