Collocations for certainty - noun

absolute, complete
near, reasonable, virtual
It's a virtual certainty that essential foodstuffs will go up in price.

moral

degree
It's difficult to predict with any degree of certainty how much it will cost.

with certainty
I couldn't say with absolute certainty that he's here.

a lack of certainty
There seems to be a lack of certainty over what we should do.

the one certainty, the only certainty
The one certainty left in a changing world is death.