in a way that is probably not true or fair, or that is probably not honest

He said that too many young people are in dubiously useful further education and unable to get the vocational training they need. 他说，有太多的年轻人正在接受有用程度可疑的延续教育，无法获得他们需要的职业培训。

The main impact of the law will be to protect the wealthy and their often dubiously acquired assets. 该法的主要影响是保护富人及其这些人通常以可疑手段获得的资产。

in a way that shows you feel doubt or do not feel sure that something is right or true

He shook his head dubiously and said that he wasn't at all sure about it. 他怀疑地摇了摇头，说他一点也不确定。

The bank manager looked dubiously at my son's passport, which bore a name that differed from the one on the account forms. 银行经理怀疑地看了看我儿子的护照，护照上的名字与账户表格上的名字不同。