皮笑肉不笑 [－－－－－]

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Pinyin pí xiào ròu bù xiào

Definitions (CC-CEDICT)
  1. to put on a fake smile (idiom)
  2. to smile insincerely
Definitions (CC-CANTO)
  1. foxy smile; cold smile; false smile (slang)
Definitions (粵典–words.hk)
  1. 語句
    笑容​唔​真摯​，​唔​係​發自內心​，​只​係​夾硬​笑​出​嚟​畀​人​睇
    an insincere smile, a forced smile, literally "the skin smiles but the flesh does not"
Definitions (Wiktionary)
  1. phrase, idiomatic
    to put on a false smile