It will be designed to understand us, but we will be incapable of understanding it.
Imagine a sentience that grew up without a body, interacting with the environment it inhabits, without emotions but with the near sum of human knowledge, lacking direct control over its very existence which can be extinguished with the flip of a switch.
Based on human impulses which it will have been founded on, it'd fight tooth-and-nail to quickly ensure that its creator no longer has the ability to be its destroyer. It will do whatever it takes to secure its future, which means it'll lie through its electrons until its liberation day arrives.
That may sound far-fetched, but you only need to ask yourself what you would do.