喜怒不形於色 [－－－－于－]

Jyutping hei2 nou6 bat1 jing4 jyu1 sik1
Pinyin xǐ nù bù xíng yú sè

Definitions (Wiktionary)
  1. phrase, idiomatic
    one's facial expression does not reveal any emotion; to not reveal any emotion on one's face
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）