The Great Gatsby
The Great Gatsby, our credulity switched back to her
I'd like to know if in this excerpt from the third chapter of The Great Gatsby the word "credulity" is used in the negative sense of "readiness to believe on weak or insufficient grounds" or in a more positive sense such as "inclination to believe":
“Oh, no,” said the first girl, “it couldn’t be that, because he was in the American army during the war.” As our credulity switched back to her she leaned forward with enthusiasm. “You look at him sometime when he thinks nobody’s looking at him. I’ll bet he killed a man.”
Thank you.