Gullibility

Illustration by Peter Newell for the poem "The Sycophantic Fox and the Gullible Raven" (Fables for the Frivolous) by Guy Wetmore Carryl.

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.

Classes of people especially vulnerable to exploitation due to gullibility include children, the elderly, and the developmentally disabled.