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出典:Wiktionary
have no sympathy (三人称単数 現在形 has no sympathy, 現在分詞 having no sympathy, 過去形および過去分詞形 had no sympathy)
"I have no sympathy for you" is similar in tone and meaning to serves you right! Both are used to express a refusal to feel sorry for a person deemed to have "earned" their plight or suffering.
have no sympathy