misgiving既可用作可数名词，又可用作不可数名词。用作可数名词时常用复数形式。

The misgivings were dispelled.疑虑消除了。
I'll try my best to free them from doubts and misgivings.我要尽力消除他们心中的疑虑。
I read the letter with a sense of misgiving.我看了那封信，感到有些怀疑。