From BiblePortal Wikipedia

King James Dictionary [1]

Uncer'Tainty, n.

1. doubtfulness dubiousness. The truth is not ascertained the latest accounts have not removed the uncertainty. 2. Want of certainty want of precision as the uncertainty of the signification of words. 3. Contingency.

Steadfastly grasping the greatest and most slippery uncertainties.

4. Something unknown.

Our shepherd's case is every man's case that quits a certainty for an uncertainty.

Webster's Dictionary [2]

(1): ( n.) The quality or state of being uncertain.

(2): ( n.) That which is uncertain; something unknown.