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1·Rose was doubtful about the whole idea.

罗斯对整个设想持怀疑态度。《牛津词典》

2·He was doubtful about accepting extra work.

他拿不定主意是否接受额外工作。《牛津词典》

3·We were doubtful about the practicability of the plan.

我们怀疑这个计划是否切实可行。《牛津词典》

4·I was still very doubtful about the chances for success.

我仍然不能肯定成功的可能性有多大。《柯林斯英汉双解大词典》

5·Glenn Schellenberg was doubtful about the claim that music education helps enhance children's intelligence.

格伦·舍伦贝格对于音乐教育有助于提高儿童智力的说法表示怀疑。

6·I'm rather doubtful about his integrity.

我对这事的忠诚颇有怀疑。

7·I'm rather doubtful about its reliability.

我很怀疑其可靠性。

8·I 'm doubtful about the value of your proposal.

我怀疑你的提议是否有价值。

9·I feel doubtful about his ability to do the work.

我怀疑他有无做这件事的能力。

10·I feel doubtful about his ability to do the work.

我有点怀疑他做这项工作的能力。

怀疑的

1·When software development teams move to agile methods, experienced project managers often struggle — doubtful about the new approach and uncertain about their new roles and responsibilities.

当软件开发小组转向敏捷方法时，有经验的项目管理人员通常与他们斗争——怀疑新的方法以及不确定他们新的角色和职责。

2·They are able to get you into negative state of mind very quickly, therefore you may become doubtful about wanting to change.

他们能很快把你拉到消极的国度里面，从而你可能开始怀疑，是否想要改变。

3·I was feeling a bit doubtful about my ability to write a drama in less than a week.

我置身公园，现在开始怀疑我是否能在一周内写出一个戏剧来。

4·I am rather doubtful about his real motive for doing this.

我颇怀疑他做此事的动机。

5·Paula Heimann wrote in the margins of a reprint of this paper that she felt doubtful about including it in her Collected Papers.

海曼在这篇论文再版的空白处写了这些，她感到怀疑，包括在她的论文集中。