unpredictability
  不可預測性; 不可預知性
  unpredictability
       n 1: the quality of being guided by sudden unpredictable impulses
            [syn: capriciousness]
       2: the trait of being unpredictably irresolute; "the volatility
          of the market drove many investors away" [syn: volatility]
       3: lacking predictability [ant: predictability]