gullible
gull + -ible
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adjective
easily persuaded to believe something; credulous:
〈人が〉信じやすい, だまされやすい
e.g. an attempt to persuade a gullible public to spend their money.
DERIVATIVES
gullibility | ˌɡələˈbilədē | noun
gullibly | -blē | adverb
ORIGIN
early 19th century: from gull2+ -ible.