Posted on 8th April 2014 by melyn Ynsidhla is the Cornish word for infiltrate Yes, infiltrate in Cornish is ynsidhla Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Oghen is the Cornish word for oxenNext post: Genys is the Cornish word for born