du·bi·ta·ble /ˈdubətəbəl ||ˈdju-/
  (a.)可疑的
  Du·bi·ta·ble a.  Liable to be doubted; uncertain. [R.] --Dr. H. More. -- Du*bi*ta*bly, adv. [R.]
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  dubitable
       adj : open to doubt or suspicion; "the candidate's doubtful past";
             "he has a dubious record indeed"; "what one found
             uncertain the other found dubious or downright false";
             "it was more than dubitable whether the friend was as
             influential as she thought"- Karen Horney [syn: doubtful,
              dubious, in question(p)]