Someone who is gullible is easily tricked or fooled because they trust people too easily and don't think critically about what they are told. They are often naive and lack experience, making them susceptible to manipulation.
Synonyms:
* Credulous
* Naive
* Trusting
* Unsuspecting
* Dupable
Example:
"The salesman's smooth talk made the gullible customer believe he was getting a good deal."