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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(1) Doubt is the beginning not the end of wisdom. 
(2) When in doubt, play trumps.
(3) Doubt is the key of knowledge.
(4) If you doubt yourself, then indeed you stand on shaky11 ground.
(5) No doubt you would like a drink.
(6) Some doubt still subsists in his mind.
(7) There is no doubt that he is guilty.
(8) There's some doubt about his suitability for the job.
(9) There's no doubt we will win.
(10) The police established his guilt beyond all doubt.
(11) El Cid's actual existence is not in doubt.
(12) There is no doubt about his innocence.
(13) There seemed to be no doubt about it.
(14) I doubt the accuracy of his statement.
(15) His religious belief was always hedged with doubt.
(16) There is no room for doubt.
(17) I doubt the truth of this report.
(18) I doubt the accuracy of your statement.
(19) Doubt is the key to knowledge.
(20) I don't doubt that he will help me.
(21) The evidence can not admit of doubt.
(22) No one could ever doubt her loyalty.
(23) Without the slightest doubt this is a remarkable exhibition.
(24) There is no doubt that Bohr's influence was immense.
(25) He insinuated his doubt of the reply. Sentencedict.com
(26) I began to doubt his sanity.
(27) I doubt the wisdom of his conduct.
(28) The guilt of the accused man was in doubt.
(29) No doubt you are wrong.
(30) Better to remain silent and be thought a fool that to speak and remove all doubt.
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.