unknowable

In its lawsuit, ExxonMobil said the law would force it “to engage in granular conjecture about unknowable future developments and to publicly disseminate that speculation on its website.”

The answer is plainly, unknowable - the great "if" that could have changed the fate of America.

This behavior also reduces serious political and societal matters to digital memes, jokes and ephemera, compromising reality testing and making truth itself unknowable.

We also know that the FBI director from 2001 to 2013, exactly the years when the invisible powers and unknowable extent of the surveillance state were most dramatically expanded, was Robert Mueller.

One source suggested frankly, even for those who work closely alongside him, it's often hard to work out what the prime minister thinks, telling me: "He often appears unknowable."