The Collaborative International Dictionary of English v.0.48:
Chanceful \Chance"ful\, a. Hazardous. [Obs.] --Spenser. [1913 Webster]WordNet (r) 3.0 (2006):
chanceful adj 1: 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, chanceful, dicey, dodgy]