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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(211) I doubt they'll be able to help but it's worth a try .
(212) I didn't know whether his story was true or not, but I decided to give him the benefit of the doubt.
(213) Her spoken English is not very good, but her meaning shone through without doubt.
(214) I have a suspicion of doubt about whether I should accept his invitation or not.
(215) There is little doubt that skin does benefit from exfoliation.
(216) He is without doubt the cleverest student I've ever taught.
(217) He's never lied to me before, so I have no reason to doubt his word.
(218) As I have already mentioned, I doubt that we will able to raise all the money we need.
(219) The evidence was clear, and there was little room for doubt.
(220) Gross's skill in motivation looked in doubt when his side began the second half badly.
(221) If there's any doubt about the rocket's engines, we ought to cancel the launch.
(222) The prosecution tried to cast doubt on her character as a witness.
(223) The prosecution must prove beyond reasonable doubt that the accused is guilty of the crime.
(224) She knew beyond a shadow of a doubt that he was lying.
(225) His intellect and mental agility have never been in doubt.
(226) It is true that Islam enjoins tolerance; there's no doubt about that.
(227) There were still areas of doubt and her apprehension grew.
(228) His muddled evidence casts doubt on his reliability as a witness.
(229) He had to be certain. There could be no room for doubt.
(230) I doubt if he'll listen to advice from me, but I'll give it a go .
(231) Only occasionally was there any doubt that they would succeed.
(232) No doubt the government contractors pshawed and pished over it.
(233) The doubt was still there, in the deep recesses of her mind.
(234) You can complain, but I doubt if it'll make any difference.
(235) Sally was without doubt one of the finest swimmers in the school.
(236) There is no doubt about her suitability for the job.
(237) No doubt he was just trying to help(http://sentencedict.com/doubt.html), but he's spoiled our work.
(238) You need perseverance to win in politics and I doubt if he can go the distance.
(239) They have the usual quota of human weaknesses, no doubt.
(240) I have no doubt that she'll tell us in the fullness of time.
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.