Uncertainty; doubtfulness; doubt.

Uncertainty due to ignorance or imperfect of knowledge. Also known as epistemic uncertainty, ignorance, subjective uncertainty, Type II or Type B uncertainty, reducible uncertainty, and state-or-knowledge uncertainty. Inclusion: An attitude towards uncertainty and risk that requires that variability in estimates, opinions, or judgments be maintained. Average estimates or opinions are not preferred because there is no reason to believe that the commonness of an opinion increases the likelihood that it is true.

the state of being unsure of something