certainty

reasonable, virtual

There is a reasonable certainty that the new restaurant will open by next month.

degree

We can say with a high degree of certainty that the storm will arrive tomorrow.

with ~

We can't know with certainty whether they'll arrive before dinner tonight.

a lack of certainty

Scientists expressed a lack of certainty about the cause of the disease.

the one/only certainty

In a job market that keeps shifting, one certainty is that good communication skills will always matter.