Definition of credulous adjective from the Oxford Advanced Learner's Dictionary

 

credulous

 adjective
adjective
BrE BrE//ˈkredjələs//
 
; NAmE NAmE//ˈkredʒələs//
 
(formal)
 
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too ready to believe things and therefore easy to trick synonym gullible compare incredulous Word Origin late 16th cent. (in the general sense ‘inclined to believe’): from Latin credulus (from credere ‘believe’) + -ous.
See the Oxford Advanced American Dictionary entry: credulous