1) Credulity 2) Credulousness 3) Innocence 1) Credulousness 2) Innocence 3) Naiveness 4) Naivete 5) Naivety 
Gullibility is a failure of social intelligence in which a person is easily tricked or manipulated into an ill-advised course of action. It is closely related to credulity, which is the tendency to believe unlikely propositions that are unsupported by evidence.{sfn|Greenspan|2009|pp=2–3}{sfn|Sofronoff|Dark|Stone|2011} Classes of people especiall...