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From The Collaborative International Dictionary of English v.0.48:
nonstarter \nonstarter\ n. 1. a person with a record of failing. Syn: loser, failure, unsuccessful person. [WordNet 1.5] 2. A horse that fails to run in a race for which it has been entered. [WordNet 1.5] 3. A proposal that will not receive serious consideration by those with authority to decide. [PJC] nonstick