There are many words and phrases that can be used to describe someone who is easily taken in. One common phrase is "gullible," which means easily fooled or deceived. Another term is "naive," which refers to someone who lacks experience or judgment and is easily persuaded. Some other synonyms include "credulous," "susceptible," "trustful," and "unskeptical." Additionally, the phrase "taken for a ride" is often used to describe someone who has been tricked or misled. It's important to be aware of these synonyms and to ensure that you don't fall prey to those who may try to take advantage of your trusting nature.