My whole life I thought nonplussed meant confused. Now I'm nonplussed. I read this article about Trump getting rid of the penny on CNBC:
this is one that most economists and others in the monetary ecosystem seem nonplussed about.
I took that to mean economists were confused. I think, though, that the author meant they were unconcerned. Now I was really nonplussed. So I googled the meaning, and found this:
I'm still nonplussed.