speculative

not financially safe or secure

• “a bad investment”
• “high risk investments”
• “anything that promises to pay too much can”
• “;”

not based on fact or investigation

• “a notional figure of cost helps in determining production costs”
• “speculative knowledge”

showing curiosity

• “if someone saw a man climbing a light post they might get inquisitive”
• “raised a speculative eyebrow”