Synonym: dubious, dubitable, in question, tentative. Similar words: doubt, no doubt, without doubt, undoubtedly, fretful, double, frightful, deceitful. Meaning: ['daʊtfʊl] 
adj. 1. open to doubt or suspicion 2. fraught with uncertainty or doubt 3. unsettled in mind or opinion.
adj. 1. open to doubt or suspicion 2. fraught with uncertainty or doubt 3. unsettled in mind or opinion. 
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(151) Mr. Curry I am somewhat doubtful about a concrete policy for hedgerows.
(152) It is doubtful whether such social occasions bring about any lasting reconciliation between the two groups.
(153) High infant mortality made such events of doubtful political importance.
(154) However, Sapolu injured an ankle in the game and on Thursday his status was downgraded from questionable to doubtful.
(155) Many other cases raise only hints, come from uncertain contexts, or are doubtful for other reasons.
(156) It is doubtful whether the claimed benefits justify the substantial costs.
(157) He read medicine at the University of Edinburgh, though it is doubtful if he ever intended to practise.
(158) Top scorer Ian Wright and skipper Tony Adams are extremely doubtful.
(159) Former Manchester United reserve Paul Dalton is rated extremely doubtful with a strained thigh muscle.
(160) In the case of the database project, it is doubtful that the machine-readable data would be of any use whatsoever.
(161) To the east lay border regions - Berry and Auvergne - where even the Duke's nominal suzerainty was at times doubtful.
(162) Whether the path will be followed and whether the forecast will prove accurate are doubtful in the extreme.
(163) Whether Richard had really uncovered a Woodville plot against himself is doubtful.
(164) Though it was doubtful that Fen's company was any less disturbing.
(165) But it is doubtful if the problem can or should be solved with spending cuts alone.
(166) It is doubtful whether much can be gained by trying to achieve any greater precision than that suggested in the definitions above.
(167) He saw they were doubtful now that this had been a serious meeting.
(168) The zone numbers are given in brackets if the record is doubtful.
(169) While she was framing a question that would not sound insultingly doubtful,[http://sentencedict.com/doubtful.html] Raffaella went on telling her story.
(170) It is now doubtful whether urinary tract infection has any role to play in the production of this renal lesion.
(171) It is doubtful that any one of the described prevention programs - in isolation - will effectively prevent abuse.
(172) In the present economic climate it is doubtful if many lots were actually sold.
(173) With Lord Jim and Grace both on his books, Pinkie felt doubtful about his chance of selling either.
(174) Without the promise, it must be doubtful whether Ibstock would have held the dividend.
(175) It said that the capital's availability in the open market was doubtful and suspect.
(176) While keeping an open mind, most archaeologists remain extremely doubtful.
(177) It was he who had inflicted an appendectomy of doubtful necessity on Harry forty-two years ago.
(178) Ards now have Erskine, Bustard and McCourt doubtful for the replay with injuries.
(179) Tight end Brent Jones is listed as doubtful on the injury report, but Mariucci said he definitely would not play Sunday.
(180) Even in that case, though, it is doubtful that Black could have obtained serious winning prospects.
More similar words: doubt, no doubt, without doubt, undoubtedly, fretful, double, frightful, deceitful, double up, delightful, at full speed, double back, double-dealing, double jeopardy, subtle, subterfuge, trouble, troubled, dour, do up, troublesome, hand out, dough, hold out, weed out, washed out, in and out, find out, stand out, send out.