"speculative" in the adjective sense
1. 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"
2. notional, speculative
not based on fact or investigation
"a notional figure of cost helps in determining production costs"
"speculative knowledge"
3. inquisitive, speculative, questioning, wondering
showing curiosity
"if someone saw a man climbing a light post they might get inquisitive"
"raised a speculative eyebrow"
Source: WordNet® (An amazing lexical database of English)
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