doubtfulness

from WordNet (r) 3.0 (2006)

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

from The Collaborative International Dictionary of English v.0.48

Doubtfulness \Doubt"ful*ness\, n.
   1. State of being doubtful.
      [1913 Webster]

   2. Uncertainty of meaning; ambiguity; indefiniteness. " The
      doubtfulness of his expressions." --Locke.
      [1913 Webster]

   3. Uncertainty of event or issue. --Bacon.
      [1913 Webster]