eisern (a) (streng) | rigide (a) (streng) |
eisern (a) (Willenskraft) | de fer (a) (Willenskraft) |
eisern (a) (streng) | inflexible (a) (streng) |
eisern (a) (metall) | de fer (a) (metall) |
eisern (a) (metall) | en fer (a) (metall) |
eisern (a) (streng) | à toute épreuve (a) (streng) |