un·ques·tion·able /-ˈkwɛsʧənəbəl, ˈkwɛʃ-/
  (a.)無疑問的,確實的,無可挑剔的
  Un·ques·tion·a·ble a.
  1. Not questionable; as, an unquestionable title.
  2. Not inviting questions or conversation. [R.]
  -- Un*ques*tion*a*bly, adv.
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  unquestionable
       adj 1: impossible to question; "unquestionable authority" [ant: questionable]
       2: not counterfeit or copied; "an authentic signature"; "a bona
          fide manuscript"; "an unquestionable antique";
          "photographs taken in a veritable bull ring" [syn: authentic,
           bona fide, veritable]
       3: not open to question; "an unquestionable (or unequivocal)
          loss of prestige"