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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(31) If you are in any doubt as to whether you should be doing these exercises, consult your doctor.
(32) Without doubt, the national bourgeoisie tends to vacillate, but we should, nevertheless, make use of its positive side, uniting with it as well as struggling against it.
(33) If you doubt yourself, then indeed you stand on shaky ground.
(34) There is some doubt about the best way to do it.
(35) The prosecution has to prove beyond reasonable doubt that he is guilty of murder.
(36) There is no doubt that grades have improved and interest in education has revived.
(37) Of course the ultimate responsibility for the present conflict without doubt lies with the aggressor.
(38) We will, no doubt, discuss these issues again at the next meeting.
(39) There is no doubt at all that we did the right thing.
(40) There was no doubt in his mind that he'd get the job.
(41) There was still a nagging doubt in the back of her mind.
(42) Our study demonstrates beyond doubt that the play was written by Shakespeare.
(43) I don't doubt her sincerity, but I think she's got her facts wrong.
(44) He says he can cure me but I still doubt him.
(45) Never doubt yourself. Never change who you are. Don't care what people think and just go for it.
(46) Some journalists have cast doubt on the authenticity of the official version of events.
(47) There's no doubt that he's in the right on this.
(48) There is no doubt that good things will come, and when it comes, it will be a surprise.
(49) I doubt if I have a single drop of aristocratic blood in my veins.
(50) No doubt he'd been looking forward to the wedding ever since it was announced(sentencedict.com), as an invaluable chance to cut a figure and do some good public relations work.
(51) I doubt I'll ever get rich, but I get job satisfaction.
(52) 'No doubt he'll give me the chance to fight him again,' he jibed, tongue in cheek.
(53) Whether he will continue to be successful in future is open to doubt.
(54) There was no doubt that he was a fine scholar.
(55) She knew without a shadow of a doubt that he was lying to her.
(55) Wish you can benefit from our online sentence dictionary and make progress day by day!
(56) He is, without the slightest doubt, the greatest living novelist.
(57) If someone truly loves you, they will never give you a reason to doubt it.
(58) New evidence has cast doubt on the guilt of the man jailed for the crime.
(59) Wastage was no doubt a necessary consequence of war.
(60) I doubt it to be truth.
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.