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From The Collaborative International Dictionary of English v.0.48:
Doubt \Doubt\ (dout), v. i. [imp. & p. p. Doubted; p. pr. & vb. n. Doubting.] [OE. duten, douten, OF. duter, doter, douter, F. douter, fr. L. dubitare; akin to dubius doubtful. See Dubious.] 1. To waver in opinion or judgment; to be in uncertainty as to belief respecting anything; to hesitate in belief; to be undecided as to the truth of the negative or the affirmative proposition; to b e undetermined. [1913 Webster] Even in matters divine, concerning some things, we may lawfully doubt, and suspend our judgment. --Hooker. [1913 Webster] To try your love and make you doubt of mine. --Dryden. [1913 Webster] 2. To suspect; to fear; to be apprehensive. [Obs.] Syn: To waver; vacillate; fluctuate; hesitate; demur; scruple; question. [1913 Webster]