"Guller" is a colloquial term typically used to describe an individual who is easily fooled or swindled. There are numerous synonyms to describe such individuals, including gullible, naive, credulous, unsuspecting, and easily deceived. Other synonyms include innocent, inexperienced, and impressionable. These terms are often used to describe individuals who lack analytical skills and fail to see through the clever schemes of con artists and fraudsters. While being trusting and optimistic can be admirable qualities, individuals who are overly trusting can be vulnerable to exploitation. Therefore, it's important to be aware of the characteristics that con artists and fraudsters prey upon and to protect oneself against scams and fraudulent activities.