problematical
  (a.)有問題的
  Prob·lem·at·ic Prob·lem·at·ic·al a.
  1. Having the nature of a problem; not shown in fact; questionable; uncertain; unsettled; doubtful; as, his theory is problematic because it fails to explain several facts. -- Prob*lem*at*ic*al*ly, adv.
     Diligent inquiries into remote and problematical guilt leave a gate wide open to . . . informers.   --Swift.
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  problematical
       adj 1: open to doubt or debate; "If you ever get married, which
              seems to be extremely problematic" [syn: debatable,
              problematic]
       2: making great mental demands; hard to comprehend or solve; "a
          baffling problem"; "I faced the knotty problem of what to
          have for breakfast"; "a problematic situation at home"
          [syn: baffling, knotty, problematic]