adjective

having or showing too great a readiness to believe things.

a ceremony staged for credulous tourists

gullible,naive,impressionable,trusting,over-trusting,over-trustful,exploitable,dupable,deceivable,easily deceived,easily taken in,easily led,unsuspicious,unwary,unguarded,unsceptical,uncritical,unquestioning,innocent,ingenuous,unworldly,inexperienced,unsophisticated,artless,guileless,green,as green as grass,callow,raw,immature,childlike,wide-eyed,simple,ignorant,wet behind the ears,born yesterday,incognizant,nescient