When it comes to describing a gullible person, there are several synonyms that can be used. One such synonym is "naive," which suggests a lack of experience or understanding that makes someone easily tricked. Another word that can be used is "credulous," which implies a willingness to believe something without evidence or proof. Similarly, "foolish" can be used to describe someone who is easily fooled or deceived. "Trustful" is another word that can be used to describe a gullible person; it suggests a belief in others and an inability to see through deceit. Finally, "unsuspecting" can be used to describe someone who is easily taken advantage of due to their lack of suspicion.