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Jyutping tit3 sek6 sam1 coeng4
Pinyin tiě shí xīn cháng

Definitions (CC-CEDICT)
  1. to have a heart of stone
  2. hard-hearted
  3. unfeeling
Definitions (粵典–words.hk)
  1. 形容詞
    唔​會​俾​私人​情感​影響​,​或者​缺乏​同理​心​,​意志​堅定​到​冷漠
    heartless; hard-hearted; unfeeling
    • 無論婆婆點求情,啲職員都要罰佢錢,真係鐵石心腸,冇嚟人情味。
      无论婆婆点求情,啲职员都要罚佢钱,真系铁石心肠,冇嚟人情味。
      mou4 leon6 po4 po2 dim2 kau4 cing4, di1 zik1 jyun4 dou1 jiu3 fat6 keoi5 cin2, zan1 hai6 tit3 sek6 sam1 coeng4, mou5 lai4 jan4 cing4 mei6.
      No matter how hard the old lady pleaded, the staff insisted on fining her. They are so hard-hearted and inhumane.
Definitions (Wiktionary)
  1. phrase, idiomatic
    stone-hearted; unmoved
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    谁能融化你的铁石心肠?
    誰能融化你的鐵石心腸?
    shuí néng róng huà nǐ de tiě shí xīn cháng ?
    • Who could melt that stone heart of yours?
  2. Mandarin
    他铁石心肠。
    他鐵石心腸。
    tā tiě shí xīn cháng 。
    • He has a heart of stone.
Examples (粵典–words.hk)
  1. Cantonese
    铁石心肠
    鐵石心腸
    tit3 sek6 sam1 coeng4
    • heartless; hard-hearted; unfeeling
  2. Cantonese
    无论婆婆点求情,啲职员都要罚佢钱,真系铁石心肠,冇嚟人情味。
    無論婆婆點求情,啲職員都要罰佢錢,真係鐵石心腸,冇嚟人情味。
    mou4 leon6 po4 po2 dim2 kau4 cing4, di1 zik1 jyun4 dou1 jiu3 fat6 keoi5 cin2, zan1 hai6 tit3 sek6 sam1 coeng4, mou5 lai4 jan4 cing4 mei6.
    • No matter how hard the old lady pleaded, the staff insisted on fining her. They are so hard-hearted and inhumane.