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Adjective: unquestionable  ,ún'kwes-chu-nu-bul
  1. Not counterfeit or copied
    "an unquestionable antique";
    - authentic, bona fide, veritable
  2. Not open to question
    "an unquestionable (or unequivocal) loss of prestige"
  3. Incapable of being questioned
    "unquestionable authority"

See also: acknowledged, beyond doubt, echt, for sure, genuine, incontestable, incontestible, indubitable, mathematical, unambiguous, undeniable, unequivocal, unimpeachable, univocal

Antonym: questionable