a.

1. 思索的；推測的
   Much of our information is speculative.

   我們的許多信息是帶推測性的。

   Due to the speculative nature of the evidences, the judge could not arrive at a concrete decision.

   因為所有的證據都是推測性的，法官無法作出具體的結論。

2. 純理論的，非實用性的
3. 冒險性的，不確定的
4. 投機的；好投機的
   speculative ventures in real estate

   房地產投機生意

adj.

1. engaged in, expressing, or based on conjecture rather than knowledge.
2. (of an investment) involving a high risk of loss.