He walked incredulously down the stairs, out to the street, and looked up at the windows of her apartment.
"Mike!" he said incredulously.
She stared at him incredulously.
Roark asked incredulously.
Keating’s face spread in incredulous pleasure; he knew that Wynand was a great authority on art and would not make such comparisons lightly.
Mallory looked at him incredulously and whispered: "How did you know that?"
She stood looking at him, looking incredulously at all the hours past.
She stood stupidly, incredulously for a moment, then she dashed to her bed to snatch a girdle she had left lying there and stuff it hurriedly under the pillow.
But he watched the shape of her mouth, the movements of her lips framing words; he watched the way she crossed her legs, a gesture smooth and exact, like an expensive instrument being folded; and he could not escape the feeling of incredulous admiration he had experienced when he had seen her for the first time.
She wanted to laugh in incredulous anger.
Toohey turned to him full face, forgetting to dole out his attention, and said incredulously: "No!"
But he looked at her, and suddenly he laughed, incredulously pleased.
She stood, incredulously, in the middle of the drawing room of his penthouse, thinking that this place was now her home and how right it looked to be her home.
Wynand stood, holding a glass, looking at Roark with a strange kind of incredulous wonder, not like a host, like an owner who cannot quite believe his ownership of his prize possession….
There are no more uses of "incredulous" in the book.
Show samples from other sources
I find it incredulous that you believe she is sincere.