Strength

крљпкий кулђк a strong fist
могџчий кулђк a powerful fist
желљзный кулђк; свинцћвый кулђк; литћй кулђк; тяжёлый кулђк; пудћвый кулђк an iron fist
NB The literal meanings of the above phrases are: свинцћвый кулђк "a fist of lead," литћй кулђк "a fist of cast metal," тяжёлый кулђк "a heavy fist," пудћвый кулђк "a heavy fist" (the word пудћвый refers to an obsolescent Russian unit of measure; 1 пџд = 16.38 kilograms).