Over-credulous is a term that describes someone who is excessively gullible or trusting. Synonyms for this word include naive, unsuspecting, credulous, and easily fooled. Other synonyms for over-credulous could be simple-minded, innocent, unsophisticated, or easily duped. People who are over-credulous are often taken advantage of by others who may manipulate or deceive them for their own gain. It is important for individuals to be cautious when dealing with those who exhibit these traits and to recognize when they may be too trusting. Being able to discern when someone is taking advantage of one's trust is an essential life skill.