How would you categorize a person who is easily fooled?

A person who is easily fooled is best described as gullible. This term specifically refers to someone who is overly willing to believe in or trust others, often without sufficient evidence. They may lack skepticism or critical thinking in evaluating situations, which makes them susceptible to deception or manipulation.

In contrast, astute individuals are known for their keen insight and ability to assess situations accurately, making them less likely to be easily fooled. Deceitful describes a person who is dishonest or intentionally misleading, while discerning refers to someone who is able to distinguish between right and wrong or good and bad, demonstrating judgment and awareness. Thus, gullible is the most fitting term for someone who readily accepts and believes what others tell them, lacking the skepticism that would protect them from being misled.