Even the humblest Party member is expected to be competent, industrious, and even intelligent within narrow limits, but it is also necessary that he should be a credulous and ignorant fanatic whose...
For how could the fear, the hatred, and the lunatic credulity which the Party needed in its members be kept at the right pitch, except by bottling down some powerful instinct and using it as a driving force?
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.