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