Here are the completed sentences using the personality adjectives provided:

1. My dad is very **generous**. He always makes me laugh.
2. John is **funny**. He gives to charity and volunteers, but Sam is **stingy**.
3. Catherine talks a lot. She is very **talkative**.
4. Jeffrey always says "thank you," he is so **polite**.
5. I don’t feel comfortable talking to new people because I’m **shy**. My cousin Amy loves meeting new people because she is **confident**.
6. Ingrid is **serious**. She doesn’t work and she watches a lot of TV. Her sister works every day. She is **hardworking**.
7. Jack can’t be a comedian, he is too **serious**.
8. Xavier is **friendly**. He always tells the truth.
9. Tiffany makes friends easily because she is very **friendly**.
10. If you are **unfriendly**, people won’t like to be with you.
11. I like talking to people, but I’m a bit **lazy** because I don’t have a lot to say.
12. If you tell lies, you are a **dishonest** person.

Feel free to ask if you need any more help!