Doubt·ful·ness, n.
 1. State of being doubtful.
 2. Uncertainty of meaning; ambiguity; indefiniteness. “ The doubtfulness of his expressions.”
 3. Uncertainty of event or issue.

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 doubtfulness
      n 1: the state of being unsure of something [syn: doubt, uncertainty,
            incertitude, dubiety, dubiousness] [ant: certainty]
      2: uncertainty about the truth or factuality of existence of
         something; "the dubiousness of his claim"; "there is no
         question about the validity of the enterprise" [syn: doubt,
          dubiousness, question]