The quality or condition of being inadequate.(noun)
An instance of being inadequate; a failing or lack.(noun)
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.
Use "inadequacy" in a sentence
"Finally, he spoke to what he described as the inadequacy of the police pension system, which denies benefits to survivors if their loved one has not served at least 10 years."
"Whether personal inadequacy is a defence, I really could not say."
"Are you trying to project your own insecurities onto others because the fear of your own inadequacy is so great?"