doubtful

I tried to reassure them, but they remained doubtful.我试图使他们安心，可他们还是心存疑虑。

She gave him a doubtful look. [=a look that shows doubt]她疑惑地看了他一眼。

They were doubtful about the benefits of the new system. = They were doubtful of its benefits.他们对新系统的优势表示怀疑。

He made the doubtful [=dubious] claim that he had never been sick a day in his life.他说他一生从未生过一天病，这未必是真的。

The truth of the statements was doubtful.这些说法不太可能是真实的。

It's highly doubtful [=unlikely, improbable] that anyone will notice.不太可能会有人留意。

It is doubtful if she really meant what she said.她未必心口如一。

The situation is bad and it's doubtful whether it will get better soon.现在形势很差，短时间内也未必能改善。

The water available in the village is of doubtful [=questionable] quality.村里可用水的水质可能有问题。

Their decisions were based on data of doubtful accuracy.他们的决定建立在不准确的数据之上。

The outcome of the election remains doubtful.选举的结果还不明朗。

The company is facing a doubtful future.公司的未来还是未知数。