Posted on 31st March 2019 by melyn Aneffeythus is the Cornish word for ineffective Yes, ineffective in Cornish is aneffeythus Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Estrek is the Cornish word for oyster-bedNext post: Brithweyth is the Cornish word for mosaic