[Dr. Sivana]

I use flummox, sinecure, nefarious, fastidious, quixotic occasionally without trying to be medieval or obscure. While sinecure might technically be a late medieval word in English, it is barely translated Latin going back a LOT farther.

[Hiddigeigei]

"I use flummox, sinecure, nefarious, fastidious, quixotic occasionally without trying to be medieval or obscure."
I thought all of these words were in common present-day usage.