doubt

doubt (http://definr.com/doubt)

     n 1: the state of being unsure of something [syn: uncertainty,
          incertitude, dubiety, doubtfulness, 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: dubiousness,
         doubtfulness, question]
     v 1: consider unlikely or have doubts about
     2: suspect to be false; "I distrust that man" [syn: suspect,
        distrust]
     3: lack confidence in; "I doubt these reports"