Gullible is an adjective that describes a person who is easily deceived or taken advantage of. Synonyms for this word include naive, credulous, trusting, innocent, unsuspecting, and vulnerable. These words all suggest a lack of experience or street-smarts, making individuals more susceptible to being manipulated or fooled. Other synonyms for gullible include unsuspicious, guileless, and ingenuous. While these words have similar meanings, they often imply different connotations. Regardless of which synonym is used, it is important to recognize the vulnerability that comes with being gullible and to exercise caution when encountering unfamiliar situations or people.