In Harry Potter and the Prisoner of Azkaban the Durlsey's told Aunt Marge that he went to St. Brutus' Secure Centre for Incurably Criminal Boys.
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The Dursley's tell everyone that Harry goes to St. Brutus's
Secure Center for Incurably Criminal Boys.
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"Incurably dishonest" typically refers to someone who cannot be cured of their tendency to be deceitful or untruthful. It implies that their dishonest behavior is deeply ingrained and unlikely to change.
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St. Brutus's secure center for incurably criminal boys
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Aktion T4 for incurably ill, Die Endlosung der Judenfrage for
the Shoah