Posted on 6th June 2020 by melyn Onpossybyl is the Cornish word for impossible Yes, impossible in Cornish is onpossybyl Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Gwarnyans is the Cornish word for warningNext post: Nerthek is the Cornish word for energetic