adj.怀疑，无把握，拿不准，可疑的，不可信的，靠不住的，不诚实的，不确定的，不一定好的

The result is still dubious.
结果仍未定。
His background is dubious.
他的背景不可靠。
What he said was dubious.
他昨天说的很含糊。
The authenticity of the artwork is dubious, and experts are divided on its origins.
这幅艺术品的真实性存疑，专家们对其来源意见不一。
His claims about winning the lottery are dubious at best, more likely a fabrication.
他声称赢得彩票的说法充其量可疑，更可能是编造的。
The witness's testimony was dubious, as it contradicted other evidence presented in court.
证人的证词很值得怀疑，因为它与法庭上出示的其他证据相矛盾。
The company's financial statements raise some doubts due to inconsistencies in their records.
公司的财务报表由于记录中的不一致而存在一些可疑之处。
She had a dubious internet connection, which made online meetings frustrating.
她的网络连接不稳定，这让在线会议变得非常令人沮丧。
The deal seems dubious, given the risks involved and the lack of clear benefits.
考虑到涉及的风险和不明朗的利益，这笔交易似乎有疑问。
The suspect's alibi was so dubious that the police began to doubt its validity.
嫌疑犯的不在场证明极其可疑，警方开始怀疑其真实性。
The effectiveness of this diet plan is dubious, as many people who've tried it have not seen significant results.
这种饮食计划的有效性存疑，因为尝试过的人并没有看到明显的效果。
The proposed law has raised eyebrows among legal scholars due to its ambiguous language and dubious constitutionality.
这项提议的法律因含糊不清的语言和可疑的宪法性引起了法学学者的关注。
After careful examination, the archaeologist concluded that the artifact was a fake, with no historical value – a dubious find indeed.
经过仔细检查，考古学家断定这件文物是假的，没有历史价值，的确是一个可疑的发现。