bad, risky, high-risk, speculative -- (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")
notional, speculative -- (not based on fact or investigation; "a notional figure of cost helps in determining production costs"; "speculative knowledge")
inquisitive, speculative, questioning, wondering -- (showing curiosity; "if someone saw a man climbing a light post they might get inquisitive"; "raised a speculative eyebrow")
(Sound)
