chance·ful /ˈʧæn(t)sfəl/
  多事的
  Chance·ful a. Hazardous. [Obs.]
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  chanceful
       adj : of uncertain outcome; especially fraught with risk; "an
             extremely dicey future on a brave new world of liquid
             nitrogen, tar, and smog"- New Yorker [syn: chancy, dicey,
              dodgy]