uncertainty: stresses lack of certitude that may range from a mere falling short of certainty to an almost complete lack of definite knowledge especially about an outcome or result: general ~ about the program’s future.   (certitude完全的certainty确定、坚信)


doubt: suggests both uncertainty and inability to make a decision: plagued by ~s about his upcoming marriage.     (Churchill: the only thing we will have to fear is fear, the only limitation to our achievement tomorrow will be our doubt today唯一阻碍我们未来取得成就的是我们今天的怀疑犹豫)


dubiety: stresses a lack of sureness that leads to a wavering between conclusions: in times of crisis a leader must be free of all ~.       （waver动摇implies hesitation after seeming to reach a decision and so connotes weakness or a retreat看似做出决定后又再次犹豫，显得软弱倒退，wavered in his support of the rebels对叛军的支持有所动摇）


skepticism: implies a habitual state of mind or customary reaction characterized by unwillingness to believe without conclusive evidence: an economic forecast that was met with ~.


suspicion: stresses lack of faith in the truth, reality, fairness, or reliability of something or someone: viewed the new neighbors with ~.


mistrust: implies a genuine doubt based upon suspicion: had a great ~ of all doctors.     (trust相信信任used with in or to, implies assurance based on faith that another will not fail one有信念有把握，认为对方不会辜负自己，如trusted in her own strength相信自己的力量，如美钞上in God we trust我们相信(信赖)上帝，如it has taken years to earn their trust花了多年才赢得他们的信任)


uncertainty不确定: 泛指不确定，从仅仅不确定到完全不知道，特别是对于结果，doubt犹豫: 不确定因而无法做决定，dubiety犹豫: 不确定以致反复动摇，skepticism怀疑: 表示不愿意在缺乏证据的情况下相信，suspicion怀疑猜忌: 指不确信（是否真实正直可靠），mistrust不信任怀疑猜忌: 因为怀疑而不信任


记忆方法: 1) 首字母UDDSSM重组为UDS MDS有的事，没的事<==怀疑

         2) 怀疑的意思是不确定mean lack of sureness about someone or something.首字母UDDSSM重组为UDS MDS有的事，没的事<==怀疑