Definition of over-credulous in English:
over-credulous
adjective ˌəʊvəˈkrɛdjʊləsˌəʊvəˈkrɛdʒʊləs
Excessively credulous; too easily deceived.
Origin
Late 16th century; earliest use found in Gabriel Harvey (c1552–1631), scholar and writer. From over- + credulous noun.