一切經音義 5.301

5.301

劇苦（其逆反蒼頡篇云劇篤也考聲云劇甚也古今正字云凡病少愈而必加劇謂甚於前也）。

劇苦 (fanqie: 其逆反 [jù]. The Cangjie pian says: "劇 means severe." The Kaosheng says: "劇 means extreme." The Gujin zhengzi says: "Whenever an illness has slightly remitted and inevitably worsens, it is called more severe than before").