быть неизменным(The healthcare law looks promising, but we'll have to wait until it's cast in concrete before we know exactly what it will do. lenoraart)
чёткий(Meeting with the Chairman of the Joint Chiefs of Staff was a problem for the Director of the FBI. It was one of those Beltway oddities, a meeting where there was no cast-iron ranking. Who was superior?4uzhoj)
железный(о здоровье, правилах и т.п.: The school's cast-iron policy on admissions fees left no leeway for needy students. • Ernest has a cast-iron constitution and never gets sick.4uzhoj)
