Incredulousness

Perhaps, one ought not to be surprised that a sudden announcement of success, even though professing to be founded upon the positive testimony of personal observation, should be met by incredulousness.

Tim O'Brien, who wrote a novel about war, has captured here the sense of incredulousness and theatricality he had while being shot at in Vietnam.

The class responds with grumbling, incredulousness, and the inevitable declaration of disbelief and resistance; "Are you serious?"