When considering “how to tell someone I’m not interested,” it’s important to keep in mind that how you say it means just as much as what you say. Part of figuring out what to say in the first place depends on what kind of vibe you’re getting from them. Some people are satisfied with a simple “no thank you”, while others might question you and ask for a more detailed explanation. Regardless of how you approach it, make sure to sound sincere and gentle in your tone instead of completely disinterested or mocking. As long as the other person doesn’t feel like you’ve put them down or put blame on them for things not working, then they should understand it.