續一切經音義 9.200

9.200

堅鞕（下五孟反切韻云堅牢也說文云從革更聲也或從石作硬亦通用）。

Hard and stiff (堅鞕: the lower character has the fanqie 五孟; the Qieyun says solid and firm; the Shuowen jiezi says it is derived from 革 with 更 as phonetic; written with 石 as 硬, it is also interchangeably used).