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insidious
used in The Great Gatsby

only 1 use
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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)
  • ...he saw Dan Cody's yacht drop anchor over the most insidious flat on Lake Superior.
    p. 98.2
insidious = dangerous in a way that is not easily seen
There are no more uses of "insidious" in The Great Gatsby.

Typical Usage  (best examples)
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