Definitively

At the present time, that statement cannot be made definitively.

That the moon appears larger close to the horizon than at the zenith is an optical illusion, the cause of which has not been definitively clarified.

To solve the problem of Palestine it would be necessary for the Palestinians to abandon the so-called Palestinian Authority and unite around a common political front to defend the rights of all Palestinians, including the refugees and their descendants who want to return to Palestine. It would also be necessary for them to definitively abandon the so-called "two-state solution," which in my opinion is very similar to the racist solution to South Africa that consisted of dividing South Africa into territories for white people and into territories supposedly "autonomous" or "independent" for the native peoples.

That can be asserted definitively.

The computer learns from its mistakes, quickly and definitively.

The cause of the flood is not definitively known.

Relations have definitively soured.

I can definitively say that this seasoning tastes better than anything you could buy in a store.

Far from making the kind of statement of hard fact that editors had readily made regarding claims about Trump’s racism, the article fails to definitively state that the laptop is not, in fact, Russian disinformation.