(noun) (with "the") Something uncertain.
"Uncertainty is an uncomfortable position. But certainty is an absurd one."
"When everything is uncertain, everything that's important becomes clear."
"Do not let fear and uncertainty stop you."
"Hope - Hope in the face of difficulty. Hope in the face of uncertainty. The audacity of hope! In the end, that is God’s greatest gift to us. A belief in things not seen. A belief that there are better days ahead."