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insidious
used in Dr. Jekyll and Mr. Hyde

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)
  • Henry Jekyll stood at times aghast before the acts of Edward Hyde; but the situation was apart from ordinary laws, and insidiously relaxed the grasp of conscience.
    p. 91.8
insidiously = in a dangerous, tricky manner
There are no more uses of "insidious" in Dr. Jekyll and Mr. Hyde.

Typical Usage  (best examples)
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