Crédulo vs. ingenuo
There are two Spanish words, crédulo and ingenuo, which translate to gullible or credulous in English. Although they appear similar, each carries a distinct nuance and usage.
Crédulo
B1Crédulo refers to someone who is easily convinced or believes things with little evidence. It usually emphasizes the readiness to believe.
Juan es muy crédulo y siempre cae en las bromas de sus amigos.
(Juan is very gullible and always falls for his friends' jokes.)
No seas tan crédulo de creer todo lo que lees en Internet.
(Don't be so gullible as to believe everything you read on the Internet.)
Los crédulos suelen ser las principales víctimas de los estafadores.
(Gullible people are often the main targets of con artists.)
Ingenuo
B1Ingenuo describes someone who is naïve or lacks sophistication, often due to innocence or inexperience. This word highlights a lack of worldly experience.
María es tan ingenua que confía en todos sin cuestionarse nada.
(María is so naïve that she trusts everyone without questioning anything.)
Su actitud ingenua le hizo pensar que todos tenían buenas intenciones.
(His naïve attitude made him think that everyone had good intentions.)
El niño era demasiado ingenuo para entender los riesgos.
(The child was too naïve to understand the risks.)
Summary
In summary, while both crédulo and ingenuo relate to believing things easily, crédulo emphasizes a tendency to believe without much evidence, and ingenuo stresses a lack of worldly experience or sophistication.