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- There's a special, insidious kind of hatred for him.4.11 — Part 4 Chapter 11 (80% in)
- He snapped orders and lost his patience before the smallest difficulty; when he lost his patience, he screamed at people: he had a vocabulary of insults that carried a caustic, insidious, almost feminine malice; his face was sullen.4.1 — Part 4 Chapter 1 (96% in)
There are no more uses of "insidious" in The Fountainhead.
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