vt.[W]

1. 怀疑；不相信；不能肯定[+whether/if][+that]
   I doubt whether Tom has taken my watch.

   我不太相信汤姆拿了我的手表。

   The judge doubted him.

   法官怀疑他。

   I do not doubt that he will succeed.

   我肯定他会成功。

2. 【古】恐怕[+（that）]

vi.

1. 怀疑[（+of/about）]
   They doubted of the feasibility of the project.

   他们对这个计划的可行性表示怀疑。

n.

1. 怀疑，不相信[C][U][（+about）][+whether/if]
2. 疑问，不确实[U]
   The outcome of the election remains in doubt.

   选举的结果仍然不能肯定。

   There is no doubt about his innocence.

   他完全是无辜的。

3. 疑虑[P1]
   We are trying to dispel his doubts.

   我们正试图消除他的疑虑。

n.

v.

1. feel uncertain about.
   ▸question the truth or fact of.
   ▸disbelieve (someone).
2. archaic be afraid.