Phrases for Disagreeing

1. I don’t think so.
2. I beg to differ.
3. I’m afraid I don’t agree.
4. I’m not so sure about that.
5. That’s not how I see it.
6. Not necessarily.
7. Yes, but… [say your opinion]
8. On the contrary.
9. (very informal) No way!
10. (very strong) I totally disagree.