adj. tail-heav·i·er, tail-heav·i·est
Having too much weight at the rear, either from overloading or from poor design and construction: a tail-heavy cargo plane.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Aeronautics) (of an aircraft) having too much weight at the rear because of overloading or poor design
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014