可疑的

The authenticity of the ancient document is dubitable.
这份古代文件的真实性值得怀疑。
His claims of having broken the world record are viewed as dubitable by many experts.
他声称打破了世界纪录，这让许多专家持怀疑态度。
The effectiveness of the new diet trend is rather dubitable.
新的饮食潮流的效果相当可疑。
Some historians cast doubt on the dubitable origins of the legend.
一些历史学家对这个传说的可疑起源表示怀疑。
The witness's testimony was deemed dubitable due to inconsistencies in their story.
由于证词中的不一致，该证人的证言被认为是值得怀疑的。
The dubitable quality of the second-hand car made the buyer hesitate.
二手车可疑的质量让买家犹豫不决。
The dubitable intentions behind his generosity raised eyebrows among his friends.
他慷慨背后的可疑动机让朋友们都感到惊讶。
The efficacy of alternative medicine remains dubitable to mainstream science.
替代医学的有效性在主流科学界仍然受到质疑。
The dubitable safety standards of the amusement park led to its closure for inspection.
游乐园的安全标准值得怀疑，导致其被关闭进行检查。
Many consider the existence of supernatural beings as purely dubitable.
许多人认为超自然生物的存在纯粹是值得怀疑的。