(s)hazardous, risky, wildinvolving risk or danger“skydiving is a hazardous sport”, “extremely risky going out in the tide and fog”, “a wild financial scheme”
(s)bad, risky, high-risk, speculativenot financially safe or secure“a bad investment”, “high risk investments”, “anything that promises to pay too much can't help being risky”, “speculative business enterprises”