From Longman Dictionary of Contemporary Englishnonstarternon‧start‧er /ˌnɒnˈstɑːtə $ ˌnɑːnˈstɑːrtər/ noun [countable usually singular] informalFAIL an idea, a plan, or a person that has no chance of success In its present form the scheme is a non-starter.
Examples from the Corpus
nonstarter• The issue of his failure to sell off stock portfolios is also a nonstarter.• Trying to find her way back out was obviously a nonstarter but staying here she would probably be spotted fairly quickly.• At the time, this was a nonstarter in Pyongyang. 