Posted on 1st December 20178th January 2017 by melyn Gwettha is the Cornish word for worst Yes, worst in Cornish is gwettha Photo by bebal Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Messianek is the Cornish word for messianicNext post: Mamveth is the Cornish word for foster-mother