speculative

这个问题引出一个推测性的但发人深省的答案。

The question invites a ___speculative but illuminating answer.

这只是一些推测性的想法，我们还需要更多证据来验证。

These are just ___speculative ideas; we need more evidence to verify them.

他在加密货币上进行了投机性投资，希望能获得高额利润。

He made a ___speculative investment in cryptocurrency, hoping for big profits.