1. He was so gullible that he believed every word the salesman said.
2. Don't be so gullible, not everything you read on the internet is true.
3. She was gullible enough to fall for his smooth talk and empty promises.
4. The gullible child believed that the tooth fairy would leave money under his pillow.
5. I can't believe how gullible she is, she fell for that scam without question.
6. He's so gullible that his friends often play pranks on him for fun.
7. The con artist preyed on gullible elderly people, taking advantage of their trust.
8. She's too gullible to see that her so-called friends are just using her.
9. Being gullible can lead to being taken advantage of by dishonest people.
10. It's important to be cautious and not too gullible when dealing with strangers.