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Adjective: incontestable  ,in-kun'tes-tu-bul
  1. Incapable of being contested or disputed
    - incontestible
  2. Not open to question; obviously true
    "incontestable evidence of a witness";
    - indisputable, undisputable

See also: bulletproof, demonstrable, demonstrated, inarguable, incontrovertible, unanswerable, unarguable, unassailable, undeniable, unquestionable, unshakable, unshakeable, watertight

Antonym: contestable