doubt doubt /ˈdaʊt/

noun

1. () The state of being unsure of something  ( doubtfulness , dubiety , dubiousness , doubt , incertitude , uncertainty )
   the state of being unsure of something
   
2. () Uncertainty about the truth, factuality or existence of something  ( doubtfulness , dubiousness , doubt , question )
   uncertainty about the truth, factuality or existence of something
    The dubiousness of his claim
   the dubiousness of his claim
    There is no question about the validity of the enterprise
   there is no question about the validity of the enterprise
   
   

verb

1. () Consider unlikely or have doubts about  ( doubt )
   consider unlikely or have doubts about
    I doubt that she will accept his proposal of marriage
   I doubt that she will accept his proposal of marriage
   
2. () Lack confidence in or have doubts about  ( doubt )
   lack confidence in or have doubts about
    I doubt these reports
   I doubt these reports
    I suspect her true motives
   I suspect her true motives
    She distrusts her stepmother
   she distrusts her stepmother