Posted on 4th June 2015 by melyn Gwethaforieth is the Cornish word for pessimism Yes, pessimism in Cornish is gwethaforieth Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: A-has is the Cornish word for severeNext post: Trevesik is the Cornish word for countryman