Sentence:  [W]ere it good / To ſet the exact wealth of al our ſtates / Al at one caſt? to ſet ſo rich a maine / On the <WSD>nice</WSD> hazard of one doubtfull houre? 
Meaning of the word marked with <WSD> tags:  Doubtful, as to the outcome; risky. (16th-19th c.)