adjective

easily persuaded to believe something; credulous.

an attempt to persuade a gullible public to spend their money

credulous,over-trusting,over-trustful,trustful,easily deceived/led,easily taken in,exploitable,dupable,deceivable,impressionable,unsuspecting,unsuspicious,unwary,unguarded,unsceptical,ingenuous,naive,innocent,simple,inexperienced,unworldly,green,as green as grass,childlike,ignorant,foolish,silly,wet behind the ears,born yesterday