Radical centrism is when people of different political beliefs come together in the middle. It's like when two friends want to play and one friend wants to play outside, and the other wants to play inside. They compromise and decide to play in the yard together.
In politics, it means that people who have different beliefs work together to try to find solutions that are fair and balanced for everyone. Radical centrism is not about just picking a side or sticking with traditional political parties. It's about analyzing the issues and coming up with the best ideas, no matter where they come from.
Sometimes people might say radical centrism is boring because it's not very extreme, but it can also mean that everyone gets a little bit of what they want. It's kind of like making a pizza with all your favorite toppings together, so that nobody feels left out.