So basically, I want to use the word infallibilism in its adjectival form and I don't whether to write infallibilist or infallibilistic. I have to say the former sounds better for some reason.
An easier example may be with minimalism. Is it "Joe's idea of decorating a room is very minimalist" or "Joe's idea of decorating a room is very minimalistic".
An answer I anticipate is that both are possible, but I would like to know what exactly the difference is, for there must be a difference, if ever so subtle.