calejar, empedernir, empedrenir, emperrar, encruar, encruecer, encruentar, endurar, endurecer, endurentar, enquistar, enresinar, insensibilizar, obdurar, ossificar, pedrar, petrificar
desenternecer, empedernir, empedrenir, encardir, lapidificar, petrificar
apedrar, empedernir, empedrar, empedrenir, enrijar, obdurar