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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(241) Thus, an adjusting entry is needed to increase the Allowance for Doubtful Accounts from its present level to $5.
(242) But his attitudes toward overseas military education change from attentiveness to repudiation. He is also doubtful and rejective to the returned students.
(243) It is not allowed to simply grade overdue loans, doubtful loans and bad loans into the five-grade classification in the process of assets classification.Sentencedict.com
(244) It was doubtful whether Israel could be persuaded to relinquish its gains.
(245) Currently, the Allowance for Doubtful Accounts hAS a credit balance of only $6, determined AS follows...
(246) It is not a state to be safely entered into doubtful feelings , with half a heart.
(247) A 12)copy editor?" Doubtful. Most of us never had the exposure to the wide array of options in the world of work."
(248) The wisdom of this exclusionary rule is doubtful, as many straightforward applications for relief from sanction should be capable of being disposed of fairly and efficiently without any oral hearing.
(249) The splendour of her shoulders, her frizzy hair might have made him doubtful.
(250) The Allowance for Doubtful Accounts often is described as a contra-asset account.
(251) When you say, "I'm rather doubtful about that", it means you don't trust something but have no idea about the truth. It's one of the circumbendibus for, "I don't trust it".
(252) The Oxford English Dictionary entry for flatter admits that its etymology is "doubtful" but suggests that flatter may be related to flat.
(253) "2009 will be characterised by bad and doubtful debts on the business side of things. 2010 will begin to move into the consumer side as unemployment begins to peak," he added.
(254) Bailout loan: Loan made to Borrower whose ability to service outstanding indebtedness has become doubtful.
(255) Police said he died after playing hide-and-seek with inmates, but this conclusion seemed doubtful.
(256) Ovarian pregnancy was often related to intrauterine device, repeated artificial abortion and cesarean section. Conclusion The doubtful cases should be performed posterior fornix...
(257) In addition, the conclusion of artificial sand fixing vegetation researching missing long period investigation and analysis is doubtful.
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.