roaring

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Very lively or successful; thriving.
• adjective Used as an intensive.

from The Century Dictionary.

• noun A loud, deep cry, as of a lion; an outcry of distress, anger, applause, boisterous mirth, or the like; loud continued sound, as of the billows of the sea or of a tempest.
• noun A disease of horses which causes them to make a singular noise in breathing under exertion; the act of making the noise so caused; also, this noise.
• Making or characterized by a noise or disturbance; disorderly; riotous.
• Going briskly; highly successful.
• A kind of humming-top.

from the GNU version of the Collaborative International Dictionary of English.

• noun A loud, deep, prolonged sound, as of a large beast, or of a person in distress, anger, mirth, etc., or of a noisy congregation.
• noun (Far.) An affection of the windpipe of a horse, causing a loud, peculiar noise in breathing under exertion; the making of the noise so caused. See Roar, v. i., 5.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Very; intensively; extremely.
• adjective Very successful; lively; profitable; thriving; prosperous.
• verb Present participle of roar.
• noun A loud, deep, prolonged sound, as of a large beast; a roar.
• noun An affection of the windpipe of a horse, causing a loud, peculiar noise in breathing under exertion.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adverb extremely
• noun a deep prolonged loud noise
• adjective very lively and profitable
• noun a very loud utterance (like the sound of an animal)