incredulous

She listened to his explanation with an incredulous smile.她带着怀疑的微笑倾听他的解释。

He was incredulous at the news.他对那条新闻表示怀疑。

Many people were incredulous that such a small fire could have caused so much damage.许多人表示怀疑，这样一场小的失火竟然造成了那么大的损失。