Adjective incontestable has 2 senses
  1. incontestable, incontestible - incapable of being contested or disputed
    Antonyms: contestable, challengeable, debatable, disputable, shakable, shakeable
  2. incontestable, indisputable, undisputable - not open to question; obviously true; "undeniable guilt"; "indisputable evidence of a witness"
    Antonym: deniable (indirect, via undeniable)
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