1doubt 
/ˈdaʊt/ verb
doubts; doubt·ed; doubt·ing /ˈdaʊt/ verb [+ obj] 1 : to be uncertain about (something) : to believe that (something) may not be true or is unlikely
▪ She began to doubt [=question] everything he said. ▪ I have always doubted the existence of life on other planets. ▪ No one doubts that the mission will be a success. ▪ I seriously doubt my parents will let me go. ▪ “Do you think you can come tonight?” “I doubt it.” 2 : to have no confidence in (someone or something)
▪ I began to doubt [=question] my own judgment. ▪ She doubted his ability to succeed. ▪ He said he could do it, but I couldn't help doubting him.
▪ She began to doubt [=question] everything he said. ▪ I have always doubted the existence of life on other planets. ▪ No one doubts that the mission will be a success. ▪ I seriously doubt my parents will let me go. ▪ “Do you think you can come tonight?” “I doubt it.”
▪ I began to doubt [=question] my own judgment. ▪ She doubted his ability to succeed. ▪ He said he could do it, but I couldn't help doubting him.
— doubt·er noun, plural doubters [count]
▪ He did everything he could to reassure the doubters.
▪ He did everything he could to reassure the doubters.
