Synonym: challenge, dispute, mistrust, question, suspect. Similar words: no doubt, without doubt, double, double up, double back, subtle, trouble, troubled. Meaning: [daʊt] 
n. 1. the state of being unsure of something 2. uncertainty about the truth or factuality of existence of something. v. 1. consider unlikely or have doubts about 2. lack confidence in or have doubts about.
n. 1. the state of being unsure of something 2. uncertainty about the truth or factuality of existence of something. v. 1. consider unlikely or have doubts about 2. lack confidence in or have doubts about. 
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(151) It was basically a selfish act, though no doubt a sophist would argue that it was done for the general good.
(152) The vacancy of the boy's expression made Father doubt if he was listening.
(153) I doubt whether / if the new one will be any better.
(154) There is no doubt that radio and television are important means of communication.
(155) There is no doubt as to where the guilt lies.
(156) Her record of dismissals casts doubt on her ability to hold down a job.
(157) I doubt if we can crowd any more people in — the place is packed already.
(158) Never once did I doubt that I would be able to execute my plan.
(159) The prosecution was able to establish beyond reasonable doubt that the woman had been lying.
(160) Last night a top criminal psychologist cast doubt on the theory.
(161) He's a competent enough officer, but I doubt he'll ever make general.
(162) No doubt he was forced to leave his family against his will.
(163) I rather doubt I'll be able to come to your party.
(164) There is an element of doubt as to whether the deaths were accidental.
(165) The research showed beyond doubt that smoking contributes to heart disease.
(166) She knew, without a shadow of a doubt , that this was where she wanted to be.
(167) There can be little doubt that he will offend again.
(168) No doubt he means to help, but in fact he just gets in the way.
(169) There isn't the slightest degree of doubt that he's innocent.
(170) Considerable doubt exists as to the precise origin of this custom.
(171) The authors no doubt overstated their case with a view to catching the public's attention.
(172) He said there was some doubt over the way Grant had died, and recorded an open verdict .
(173) There are reasons to doubt that a second trial is morally, legally or politically justified.
(174) This proves without a shadow of doubt that we were right.
(175) There is no doubt but that he will win the election.
(175) Sentencedict.com try its best to gather and create good sentences.
(176) There is no doubt that the Qing Dynasty postdates the Ming Dynasty.
(177) The proposed development has been thrown into doubt by the decision.
(178) Everything is clear now; no one would doubt what to be done.
(179) Even assuming that smokers do see the health warnings, I doubt they'll take any notice.
(180) There remains considerable doubt over when the intended high-speed rail link will be complete.
More similar words: no doubt, without doubt, double, double up, double back, subtle, trouble, troubled, dour, do up, dough, hand out, hold out, in and out, weed out, stand out, send out, find out, washed out, spread out, tremendous.