The progress of events showed him, on the contrary, a France which every day left a little stronger, and he aroused himself from his disbelieving, disillusioned mood.
Her gaze remained on him, disbelieving.
"Sure, hon," she said, clearly disbelieving.
Jule was clearly disbelieving.
There is no evidence that carbon monoxide is ever produced, indeed there are strong reasons for disbelieving in its occurrence.