Seek no mercy from me, sir, in behalf of the fellow who has imposed upon your childish credulity, but let him expect the worst that I can do.’
It is remarkable that what we call the world, which is so very credulous in what professes to be true, is most incredulous in what professes to be imaginary; and that, while, every day in real life, it will allow in one man no blemishes, and in another no virtues, it will seldom admit a very strongly-marked character, either good or bad, in a fictitious narrative, to be within the limits of probability.
There are no more uses of "credulous" in the book.
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The trick would fool none but the most credulous.
She is so credulous she believes everything she reads.