Synonyms of 'gullibility'
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Credulity is a willingness to believe that something is real or true.
The plot stretches credulity to the limits.
naïveté or naivety
Innocence is the quality of having no experience or knowledge of the more complex or unpleasant aspects of life.
the sweet innocence of youth
Thesaurus for gullibility from the Collins English Thesaurus