1The company's speculative investments in the tech sector have yielded mixed results so far.
2Is the theory that the universe is infinite purely speculative, or is there empirical evidence to support it?
3The article presented a speculative analysis of the potential consequences of a global economic downturn.
4Avoid making speculative decisions without consulting the relevant data and expert opinions.
5Philosophers often engage in speculative discussions about the nature of reality and human existence.