音标：['dautful] ；柯林斯词典等级：2 级；

a. 可疑的, 疑心的, 不明确的
[法] 怀疑的, 有疑问的, 未确的

s. open to doubt or suspicion
s. fraught with uncertainty or doubt
s. unsettled in mind or opinion

考试类型：[四级/六级/托福/IELTS]

词性分布：

形容词100%

doubtful的用法和样例：

例句

用作形容词(adj.)

It is doubtful whether it is true or not.这件事的真假是可疑的。
The fact that he won the first place is doubtful.他得了第一名是让人可疑的。
He is an author of doubtful reputation.他是一位名声不太好的作家。
The ethics of his decision are doubtful.他的这一决定是否合乎道德规范值得怀疑。
I am doubtful about the propriety of granting such a request.我怀疑答应这项要求是否合适。
It is doubtful whether the old man will recover from the operation.那老人手术后是否会康复难以确定。

常见句型

用作形容词(adj.)

用作定语～+ n.

This is a doubtful battle.这是一场胜负难测的战争。
Let's try to clear up our difficult and doubtful points.让我们设法把难处和疑点解决一下。

用作表语S+be+～

The weather looks very doubtful.这天气很靠不住。
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。

S+be+～+ prep .-phrase

I feel very doubtful about this.我对这点很怀疑。
I feel doubtful about his ability to do the work.我怀疑他有无做这件事的能力。
He was doubtful of the patient's recovery.他怀疑病人是否痊愈。
I am very doubtful of that.我很疑心那件事。

S+be+～+wh-to- v

I'm doubtful where to go.该往哪里去我心中无底。

S+be+～+wh-clause

I feel doubtful what I ought to do.我不知该做什么。
She is doubtful whether her mother really likes the present.她怀疑她母亲是否真喜欢那个礼物。

It is/was+～+that/wh-/if-clause

It is doubtful if our resources will hand out for more than two or three days more.我们的资源能否再维持两三天以上,值得怀疑。
It is doubtful whether it is true or not.这事的真假是可疑的。
It is not doubtful that he will give up smoking.他会戒烟是不用怀疑的。

词汇搭配

existence doubtful疑存
doubtful hit可疑刺或劈
doubtful prognosis预后可疑,预后难定...
doubtful operation原因不茂作,原因不明...
doubtful circuit可疑电路
doubtful loan可疑放款
doubtful breach可疑犯规动作...
be doubtful about对 ... 感到疑惑...
doubtful species可疑种
doubtful debts provision预提坏账准备...
doubtful assets可疑资产
position doubtful疑位
doubtful debts可疑债务
doubtful accounts[经] 呆帐, 可疑...
doubtful debt呆帐
play a doubtful card采用不可靠的办法...

经典引文

A doubtful Passage in a Latin Poet.
出自：Addison
The question whether certain doubtful forms should be ranked as species or varieties.
出自：C. Darwin
It was doubtful if he knew who Andrew Jackson was.
出自：Scott Fitzgerald
A change which is not an unquestionable improvement is a doubtful blessing.
出自：E. F. Schumacher

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