ill-fit·ting (?l?f?t??ng)adj.1. Not fitting well or correctly: ill-fitting pants.2. Unsuitable or inappropriate: ill-fitting levity.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.ill-fitting adj 1. badly fitting 2. (Clothing & Fashion) badly fitting Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014