Uncontrollably exuberant; unruly: "Common to both his illustrations and his independent paintings . . . and lurking below their rumbustious surface, is a sympathy for the vulnerability of the ordinary human being” ( Christopher Andreae).
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.