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