doubtful
- adj.可疑的;怀疑;不确定;未必;不明朗;不大可能;低劣的;拿不定主意;难说;悬而未定;可能变糟
派生词： doubtfully adv.
doubt 怀疑,疑惑 + -ful 形容词后缀
doubtfuladj.
拿不定主意；不确定；怀疑
not sure; uncertain and feeling doubt
Rose was doubtful about the whole idea.
罗斯对整个设想持怀疑态度。
He was doubtful about accepting extra work.
他拿不定主意是否接受额外工作。
未必；难说；不大可能
unlikely; not probable
It's doubtful if this painting is a Picasso.
这未必就是毕加索的画。
With her injuries it's doubtful that she'll ever walk again.
她多处受伤，今后能否行走还很难说。
It's doubtful whether the car will last another year.
这辆汽车未必还能用上一年。
He is injured and is doubtful for the game tomorrow (= unlikely to play) .
他受了伤，明天未必能参赛。
不明朗；悬而未定；可能变糟
uncertain and likely to get worse
At the beginning of the war things were looking very doubtful.
战争刚开始时，形势看上去很不明朗。
低劣的；未必是真的；靠不住的
of low value; probably not genuine or of a quality that you can rely on
This wine is of doubtful quality.
这酒的质量有问题。
doubtful
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1
ADJ-GRADED 未必的;不大可能的
If it is doubtful that something will happen, it seems unlikely to happen or you are uncertain whether it will happen.For a time it seemed doubtful that he would move at all...
有一段时间他似乎根本不会搬家。
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2
ADJ-GRADED 怀疑的;疑惑的;拿不定主意的
If you are doubtful about something, you feel unsure or uncertain about it.I was still very doubtful about the chances for success...
我对能否成功仍然深表怀疑。
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Keeton shook his head doubtfully.
基顿疑惑地摇了摇头。
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4
ADJ-GRADED (质量或价值)低劣的，不可靠
If you say that something is of doubtful quality or value, you mean that it is of low quality or value....selling something that is overpriced or of doubtful quality...
售卖漫天要价或质量低劣的东西
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5
ADJ-GRADED (通常指运动员因伤)不大可能参加（比赛）的
If a sports player is doubtful for a match or event, he or she seems unlikely to play, usually because of injury.Forsyth is doubtful for tonight's game with a badly bruised leg.
福赛斯腿部严重擦伤，不大可能参加今晚的比赛。
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6
不要混淆 doubtful, dubious, suspicious。doubtful 指不确定某事或不确定其是否会发生或成功：Do you feel insecure and doubtful about your ability（你对自己的能力缺乏信心，抱有怀疑吗），It was doubtful he would ever see her again（他会不会再见到她还说不准）。dubious 指拿不准做某事是否正确：Alison sounded very dubious（艾利森听上去犹豫不决），The men in charge were a bit dubious about taking women on（几位男性负责人有点儿拿不准要不要招女员工）。dubious 还可指某事物不完全可信、安全或可靠：his dubious abilities as a teacher（他的教学能力令人怀疑）。suspicious 指不信任某人，怀疑其从事欺骗性或不法活动：I am suspicious of his intentions（我怀疑他动机不纯），Miss Lenaut had grown suspicious（莱诺小姐已经起了疑心）。suspicious 还可指某人的行为可疑、不诚实、涉及非法或具有危险性：He listened for any suspicious sounds（他注意倾听任何可疑的声音），in suspicious circumstances（在可疑的情势下）。
D
adj
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1
- fraught with uncertainty or doubt
- they were doubtful that the cord would hold
- it was doubtful whether she would be admitted
- dubious about agreeing to go
- Synonym: dubious
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2
- open to doubt or suspicion
- the candidate's doubtful past
- he has a dubious record indeed
- what one found uncertain the other found dubious or downright false
- it was more than dubitable whether the friend was as influential as she thought"- Karen Horne
- Synonym: dubious dubitable in question(p)
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3
- unsettled in mind or opinion
- drew a few tentative conclusions
- Synonym: tentative
数据来源：WordNet
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He is a doubtful character .
他是个可疑的人物。
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In truly doubtful cases , only test crosses will reveal the actual genotype .
在确实可疑的情况下，只有通过杂交试验才能揭示出真正的基因型。
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It 's doubtful whether the car will last another year .
这辆汽车未必还能用上一年。
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At the beginning of the war things were looking very doubtful .
战争刚开始时，形势看上去很不明朗。
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It 's doubtful whether there 'll be any seats left .
看来未必还有座位。
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He is injured and is doubtful for the game tomorrow .
他受了伤，明天未必能参赛。
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Rose was doubtful about the whole idea .
罗斯对整个设想持怀疑态度。
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This wine is of doubtful quality .
这酒的质量有问题。
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With her injuries it 's doubtful that she 'll ever walk again .
她多处受伤，今后能否行走还很难说。
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We were doubtful about the practicability of the plan .
我们怀疑这个计划是否切实可行。
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It 's doubtful if this painting is a Picasso .
这未必就是毕加索的画。
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The arrangement is of doubtful legality .
这项约定是否合法值得怀疑。
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For a time it seemed doubtful that he would move at all
有一段时间他似乎根本不会搬家。
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They also seemed of very doubtful value .
它们好像也没有多大价值。
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Whether the authorities will allow inspection is highly doubtful .
当局是否允许检查还是个大问号。
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I was still very doubtful about the chances for success
我对能否成功仍然深表怀疑。
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They paused at the top of the stairs , doubtful as to which way to go next
他们在楼梯顶部停住了，不知道接下来该往哪边走。
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Why did he sound so doubtful ?
为什么他听上去如此不确定？
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Ecologists argue that the benefits of treating sewage with disinfectants are doubtful .
生态学家认为用消毒剂处理污水是否有益值得怀疑。
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It is doubtful whether Tweed , even with his fluent French , passed for one of the locals
尽管特威德能说一口流利的法语，他是否能被当作当地人还很难说。
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Forsyth is doubtful for tonight 's game with a badly bruised leg .
福赛斯腿部严重擦伤，不大可能参加今晚的比赛。
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The speaker was clearly playing to the gallery when he uttered so many doubtful jokes .
演说者讲了这么多似是而非的笑话，显然是迎合低级趣味。
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As soon as he finished , his supporters applauded vigorously , but most of the masses were taken aback and exchanged doubtful glances .
他的话完了，他的几个支持者拼命地鼓掌，而更多的人却噤若寒蝉，面面相觑。
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I feel doubtful about his ability to do the work .
我怀疑他有无做这件事的能力。
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Everyone was doubtful at first , but his statement in detail held up .
起初大家都怀疑，但他的详细叙述证明情况属实。
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His future success is doubtful .
他未来的成功值得怀疑。
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This is a doubtful battle .
这是一场胜负难测的战争。
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It 's doubtful that a computer program can do that-at least , not without some undesirable results .
一个电脑程序是否能做到这种地步令人怀疑——至少，一些不希望看到的结果恐怕难以避免。
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Yet like many college teachers around the U.S. , the faculty remain doubtful that their work as educators can be measured by a " learning outcome " such as a graduate 's ability to investigate and reason .
但是，就像美国其他大学的很多教师一样，普渡大学的教员们也怀疑自己作为教育者的工作是否能用“学习成果”，例如毕业生的研究和推理能力来衡量。
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Americans are less doubtful when it comes to politics : 73 % expect to see a female president in their lifetime .
在政治方面，美国人对此更有信心:73%的人希望在有生之年能见到一位女性总统。