Posted on 16th February 2014 by melyn Perfydhder is the Cornish word for perfection Yes, perfection in Cornish is perfydhder Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Routyell is the Cornish word for routerNext post: Pis is the Cornish word for piece