conjectural

The archaeologist admitted that her theory about the ancient tool was largely conjectural, based on incomplete evidence.

这位考古学家承认，她对古代工具的理论在很大程度上是推测性的，基于不完整的证据。

Without more data, any conclusions we draw about the company's future remain purely conjectural.

如果没有更多数据，我们对公司未来得出的任何结论都纯粹是推测性的。

His explanation of the phenomenon seemed plausible but turned out to be entirely conjectural.

他对这一现象的解释看似合理，但结果完全是推测性的。