no-good (n??go?od?)adj. Having no value, use, merit, or virtue.n. One that is worthless.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.no-good adj good-for-nothing; worthless Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014no-good (adj. ?no??g?d; n. ?no??g?d) adj. 1. lacking worth or merit; useless; bad. n. 2. a person or thing that is worthless or undependable. [1905?10, Amer.] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.