Posted on 20th February 2020 by melyn Gwethafor is the Cornish word for pessimistic Yes, pessimistic in Cornish is gwethafor Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Pinaval is the Cornish word for pineappleNext post: Mencyon is the Cornish word for mention