Arguably

I like to use the word "arguably" when I make statements. More specifically, it's when I make statements that I know people would argue with me about. 

The word really means that the statement can be argued to be true (which also means that it could be argued to be false). I personally like to use it for two situations. One is to prevent an argument from starting by acknowledging that the statement is controversial. The other is to set up an argument for why the statement could be true. 

It's a handy tool to prevent a situation from getting out of hand. It also sounds pretty good and somehow makes statements sound classier or more intelligent. If you don't use it, try it out. It might suit you nicely.