staunch russian
сто́йкость
firmness, steadfastness, staunchness, stableness, stability, resistance, durability
твердока́менный
steadfast, staunch, unflinching, unwavering
вы́держанность
firmness, steadfastness, staunchness, self-control, self-command, self-possession, consistency
вы́держанный
self-possessed, self-restrained, staunch, steadfast, consistent