Webster's English Dictionary

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uncertainty

un.cer.tain.ty \-*n-te-\ n 1: the quality or state of being uncertain : 
   DOUBT  2: something that is uncertain KEPTICISM, SUSPICION, MISTRUST mean 
   lack of sureness about someone or something. UNCERTAINTY may imply a 
   falling short of certainty or an almost complete lack of definite knowledge 
   esp. about an outcome or result; DOUBT suggests both uncertainty and 
   inability to make a decision; DUBIETY stresses a wavering between 
   conclusions; DUBIOSITY suggests vagueness or mental confusion; SKEPTICISM 
   implies unwillingness to believe without conclusive evidence; SUSPICION 
   stresses lack of faith in the truth, reality, fairness, or reliability of 
   something or someone; MISTRUST implies a genuine doubt based upon suspicion 
   SYN syn UNCERTAINTY, DOUBT, DUBIETY, DUBIOSITY, S