tsìng-kòo正告

to earnestly admonish

to earnestly admonish; to warn sternly; to warn in all seriousness

English Wiktionary, “正告” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E6%AD%A3%E5%91%8A · confidence: Medium (Wiktionary, Hokkien)