stern

stern

that cannot be bent; refusing to change or be influenced

stubborn

the commonest metal (symbol Fe), used in manufacturing and building, an also forming an essential part of blood; a flat-bottomed implement heated and used for smoothing clothes etc

hard, tough; inflexible

demanding and enforcing obedience; severe; strict; the back end (of a ship or boat)

serious, authoritarian

not easily bent or changed in shape; hard to stir, work, move etc; formal, unfriendly; thoroughly; a dead body

hard, inflexible