憂心如焚 [忧－－－]

Jyutping jau1 sam1 jyu4 fan4
Pinyin yōu xīn rú fén

Definitions (CC-CANTO)
  1. to be dreadfully worried and anxious
Definitions (Wiktionary)
  1. phrase, idiomatic
    extremely anxious; extremely worried; burning with anxiety
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）