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unquestionable

unquestionable - adjective

  1. Established beyond a doubt: certain, hard, inarguable, incontestable, incontrovertible, indisputable, indubitable, irrefutable, positive, sure, unassailable, undeniable, undisputable. See certain. true.
  2. Without any doubt: clear, clear-cut, decided, definite, distinct, pronounced. See certain.
  3. Not counterfeit or copied: actual, authentic, bona fide, genuine, good, indubitable, original, real, true, undoubted. See true.