doubt Play nounA feeling of uncertainty or lack of conviction.verbFeel uncertain about. SYNONYMS apprehensioncharinessconfusioncynicismdemurraldiffidencedisbeliefdistrustdoubtfulnessdubietydubiousnesshesitancyhesitationincertitudeincredulityindecisioninhibitioninsecurityirresolutionlack of certaintylack of confidence/convictionlack of convictionlack of trustleerinessmisbeliefmisgivingsmistrustqualmsqueriesquestion markquestioningquestionsreservationsscepticismsuspicionsuspicionsunbeliefuncertaintyuneaseuneasinessunsurenessvacillationwarinesswavering