2. (verb)doubt, dubiousness, doubtfulness, question uncertainty about the truth or factuality or existence of something Synonyms: dubiety, incertitude, doubtfulness, doubt, interrogative sentence, dubiousness, uncertainty, query, motion, inquiry, head, interrogative, enquiry, interrogation, question
3. (verb)doubt consider unlikely or have doubts about
4. (verb)doubt lack confidence in or have doubts about