<p><strong>Verb</strong></p><ul><li>(used with object) to be uncertain about; consider questionable or unlikely; hesitate to believe: The police have good reason to doubt his alibi.</li><li>(used without object) to be uncertain about something; be undecided in opinion or belief: The priest told me that it was normal to doubt, but encouraged me to nurture my faith.</li></ul><p><strong>Noun</strong></p><ul><li>a feeling of uncertainty about the truth, reality, or nature of something: We all had our doubts about your mysterious Canadian girlfriend since no one has ever seen her in person.</li><li>distrust or suspicion: Voters naturally held some doubt about the abrupt change in policy direction issued by city hall.</li><li>a general feeling of uncertainty, worry, or concern: Set your doubts aside, and listen to my business idea with an open mind.</li><li>a state of affairs such as to occasion uncertainty.</li><li>Obsolete: fear; dread.</li></ul>