say it: nahn-STAHR-tur
nonstarter is a noun meaning "a person with a record of failing; someone who loses consistently". It carries 2 recorded senses.
a person with a record of failing; someone who loses consistently
a horse that fails to run in a race for which it has been entered
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for nonstarter come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.