似笑非笑 [－－－－]

Jyutping ci5 siu3 fei1 siu3
Pinyin sì xiào fēi xiào

Definitions (CC-CEDICT)
  1. like a smile yet not a smile (idiom)
Definitions (Wiktionary)
  1. phrase, idiomatic
    to give a faint or forced smile