鐵心石腸 [铁－－肠]

Jyutping tit3 sam1 sek6 coeng4
Pinyin tiě xīn shí cháng

Definitions (Wiktionary)
  1. phrase, idiomatic, literary
    Synonym of 鐵石心腸／铁石心肠 (tiěshíxīncháng, “stone-hearted; unmoved”).
    (syn.) 鐵石心腸, 铁石心肠