doubt, dubiousness, doubtfulness, question -- (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")
Overview of verb doubt
The verb doubt has 2 senses
doubt -- (consider unlikely or have doubts about; "I doubt that she will accept his proposal of marriage")
doubt -- (lack confidence in or have doubts about; "I doubt these reports"; "I suspect her true motives"; "she distrusts her stepmother")