A sceptical person is doubtful about something.

一个持怀疑态度的人对某事表示怀疑。

We were doubtful about what the government was saying.

我们一直怀疑政府的说法。

I was doubtful about the old man's good intentions.

这个老头的好意令我起疑。

As for myself, I'm doubtful about writing classes, but not entirely against them.

就我本人来说，我对写作课程持怀疑态度，但不完全反对。

He was doubtful about whether he'd be any good at being someone's dad.

他很怀疑自己能不能胜任做父亲。

'I'm doubtful about it, ' replied Fagin, with a sigh.

“我对此表示怀疑，”费金叹了口气回答道。

She was doubtful about the interview from the off.

【off】她从一开始就对面试心存疑虑。

He is intent on passing the examination , but I am doubtful about his chances.

4.他一心想通过考试，但我对他的机会表示怀疑。

A dubious person lacks a definite opinion or is doubtful about something; this sense of the word is usually used with about.

多疑的人缺乏明确的意见或对某事持怀疑态度；这个词的这个意思通常与about一起使用。

One reason is that, according to findings of a new survey of office workers conducted by Wakefield Research for the IT company Citrix, most bosses are doubtful about remote working.

原因之一是，根据韦克菲尔德研究中心为 IT 公司思杰进行的一项针对办公室职员的新调查结果，大多数老板对远程工作持怀疑态度。