[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.

[Dr. Sivana]

If not common, far from obscure, archaic, or obsolete. I just checked, and in the last six years there were four movies named “Nefarious”.