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English definition of “gullible”

gullible

adjective     /ˈɡʌlɪbl/
Someone who is gullible is easily tricked because they trust people too much: How could you be so gullible?Stupid and sillyOf unsound mindNaive and trustingInexperienced (of people)
(Definition of gullible adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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