The idiom "heart of stone" originates from the idea that a heart, as the symbol of emotion and compassion, should be warm and soft, but when described as "of stone," it signifies a person's lack of empathy, compassion, or emotional responsiveness. It is used to imply that someone is emotionally cold, unfeeling, or indifferent.

What is the origin of the idiom "heart of stone" and when to use it?

英語での「heart of stone」の定義と意味

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