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

 

gullible

 adjective
adjective
BrE BrE//ˈɡʌləbl//
 
; NAmE NAmE//ˈɡʌləbl//
 
 
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too willing to believe or accept what other people tell you and therefore easily tricked synonym naive The advertisement is aimed at gullible young women worried about their weight. Word Origin early 19th cent.: from gull ‘fool or deceive’ + -ible.
See the Oxford Advanced American Dictionary entry: gullible