Posted on 24th February 2018 by melyn Tonteth is the Cornish word for impertinence Yes, impertinence in Cornish is tonteth Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Dorna is the Cornish word for bashNext post: Heweres is the Cornish word for helpful