What is Doubt ?
Doubt is (noun) 1. not being sure Even the staunchest believer sometimes has doubts. to have doubts about to say that you are doubtful about I have my doubts about the accuracy of the figures. to cast doubt on to be unsure about He cast doubt on the whole proposal. to give someone the benefit of the doubt to allow someone to continue doing something, because you are not sure that accusations made against him are correct The referee gave him the benefit of the doubt. 2. no doubt certainly No doubt they will be suing for damages. there’s no doubt about it is a certain fact There’s no doubt about it France is the best place for a holiday. There’s no doubt about his guilt. in doubt not sure The result of the game was in doubt until the last minute. (verb) not to be sure of something I doubt whether he will want to go to the funeral. I doubt her honesty. Did you ever doubt that we would win?
source: Easier English, Student Dictionary Upper Intermediate Level