1. hazardous, risky, wild, dangerous (vs. safe), unsafe

usage: involving risk or danger; "skydiving is a hazardous sport"; "extremely risky going out in the tide and fog"; "a wild financial scheme"

2. bad, risky, high-risk, speculative, unsound (vs. sound)

usage: not 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"

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See also: risky (Dictionary)