How to Use "nonchalant" with Example Sentences

1. To them , it is obvious why people are so nonchalant about the terms .
2. I tried to sound nonchalant , but it came out as defensive .
3. I am not saying start being nasty . All I am advocating is to be nonchalant .
4. He was excited but still very nonchalant .
5. I try to be as nonchalant and casual as possible while we have lunch .