Everyone was incredulous when it was reported that he had a vocation for the priesthood.
"And do you mean to say," asked Mr. Browne incredulously, "that a chap can go down there and put up there as if it were a hotel and live on the fat of the land and then come away without paying anything?"
There are no more uses of "incredulous" in the book.
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I find it incredulous that you believe she is sincere.