一成不变 Traditional 一成不變 yī chéng bù biàn 🔊 immutable HSK 7–9 + Keep this word Meanings yī chéng bù biàn 一成不變 (idiom) immutable; impervious to change; set in stone Its characters 一yīoneHSK 1成chéngto succeedHSK 6不bùnot; noHSK 1变biànto changeHSK 3