steadfast russian

• твёрдый

  hard, solid, stable

  firm, strong, steadfast

• му́жественный

  courageous, manly, steadfast

• твёрдость

  hardness, solidity, firmness, steadfastness

• сто́йкость

  firmness, steadfastness, staunchness, stableness, stability, resistance, durability

• непоколеби́мый

  firm, steadfast, unshakeable, unflagging, unflinching

• твердока́менный

  steadfast, staunch, unflinching, unwavering

• вы́держанный

  self-possessed, self-restrained, staunch, steadfast, consistent

• непоколеби́мость

  firmness, steadfastness

• неукло́нный

  steadfast, unflinching, steady