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.[1][2]

Classes of people especially vulnerable to exploitation due to gullibility include children, the elderly, and the developmentally disabled.[2][3]