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insidious
used in The Fountainhead

2 uses
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Definition
not appearing dangerous, but actually very harmful over time

or:

treacherous  (dangerous due to trickery or from hidden or unpredictable risks)
  • 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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