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used in Unbroken by Hillenbrand

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


treacherous  (dangerous due to trickery or from hidden or unpredictable risks)
  • In Naoetsu's little POW insurgency, perhaps the most insidious feat was pulled off by Louie's friend Ken Marvin, a marine who'd been captured at Wake Atoll.
    p. 285.6
  • As bad as were the physical consequences of captivity, the emotional injuries were much more insidious, widespread, and enduring.
    p. 346.9

There are no more uses of "insidious" in Unbroken by Hillenbrand.

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