doubtful

adj.

难以预测的；难以预料的，未定局的；怀疑的，拿不准的；不明不白

doubtful of怀疑的，可疑的；对…怀疑

doubtful about怀疑的，可疑的；对…怀疑

1. It is doubtful whether it is true or not.
   这件事的真假是可疑的。
2. The fact that he won the first place is doubtful.
   他得了第一名是让人可疑的。
3. He is an author of doubtful reputation.
   他是一位名声不太好的作家。
4. The ethics of his decision are doubtful.
   他的这一决定是否合乎道德规范值得怀疑。
5. I am doubtful about the propriety of granting such a request.
   我怀疑答应这项要求是否合适。
6. It is doubtful whether the old man will recover from the operation.
   那老人手术后是否会康复难以确定。

The bottlenose dolphin community of Doubtful Sound features a large proportion of long-lasting associations
Epiluminescence Microscopy for the Diagnosis of Doubtful Melanocytic Skin Lesions: Comparison of the ABCD Rule of Dermatoscopy and a...
The ABCD rule of dermatoscopy. High prospective value in the diagnosis of doubtful melanocytic skin lesions.
Kellgren & Lawrence grade 1 osteophytes in the knee—doubtful or definite?
Male and female bottlenose dolphins Tursiops sp. have different strategies to avoid interactions with tour boats in Doubtful Sound, ...
To spritz or not to spritz: The doubtful value of aimless iontophoresis
Quality criteria were proposed for measurement properties of health status questionnaires
Financial exchange system having automated recovery/rollback of unacknowledged orders
Multiple engine information retrieval and visualization system
The Effects of Focus and Diversification on Bank Risk and Return: Evidence from Individual Bank Loan Portfolios